diff --git a/doc/_static/js/custom.js b/doc/_static/js/custom.js
deleted file mode 100644
index 23a23409821..00000000000
--- a/doc/_static/js/custom.js
+++ /dev/null
@@ -1,218 +0,0 @@
-// Copyright (c) 2019-2020, Juan Linietsky, Ariel Manzur and the Godot community
-// Copyright (c) 2021, Teslabs Engineering S.L.
-// SPDX-License-Identifier: CC-BY-3.0
-
-// sphinx-rtd-theme customizations.
-
-// Handle page scroll and adjust sidebar accordingly.
-// Each page has two scrolls: the main scroll, which is moving the content of the page;
-// and the sidebar scroll, which is moving the navigation in the sidebar.
-// We want the logo to gradually disappear as the main content is scrolled, giving
-// more room to the navigation on the left. This means adjusting the height
-// available to the navigation on the fly. There is also a banner below the navigation
-// that must be dealt with simultaneously.
-const registerOnScrollEvent = (function(){
-  // Configuration.
-
-  // The number of pixels the user must scroll by before the logo is completely hidden.
-  const scrollTopPixels = 148;
-  // The target margin to be applied to the navigation bar when the logo is hidden.
-  const menuTopMargin = 80;
-  // The max-height offset when the logo is completely visible.
-  const menuHeightOffset_default = 230;
-  // The max-height offset when the logo is completely hidden.
-  const menuHeightOffset_fixed = 90;
-  // The distance between the two max-height offset values above; used for intermediate values.
-  const menuHeightOffset_diff = (menuHeightOffset_default - menuHeightOffset_fixed);
-
-  // Media query handler.
-  return function(mediaQuery) {
-    // We only apply this logic to the "desktop" resolution (defined by a media query at the bottom).
-    // This handler is executed when the result of the query evaluation changes, which means that
-    // the page has moved between "desktop" and "mobile" states.
-
-    // When entering the "desktop" state, we register scroll events and adjust elements on the page.
-    // When entering the "mobile" state, we clean up any registered events and restore elements on the page
-    // to their initial state.
-
-    const $window = $(window);
-    const $sidebar = $('.wy-side-scroll');
-    const $search = $sidebar.children('.wy-side-nav-search');
-    const $menu = $sidebar.children('.wy-menu-vertical');
-    const $ethical = $sidebar.children('.ethical-rtd');
-
-    // This padding is needed to correctly adjust the height of the scrollable area in the sidebar.
-    // It has to have the same height as the ethical block, if there is one.
-    let $menuPadding = $menu.children('.wy-menu-ethical-padding');
-    if ($menuPadding.length == 0) {
-      $menuPadding = $('<div class="wy-menu-ethical-padding"></div>');
-      $menu.append($menuPadding);
-    }
-
-    if (mediaQuery.matches) {
-      // Entering the "desktop" state.
-
-      // The main scroll event handler.
-      // Executed as the page is scrolled and once immediately as the page enters this state.
-      const handleMainScroll = (currentScroll) => {
-        if (currentScroll >= scrollTopPixels) {
-          // After the page is scrolled below the threshold, we fix everything in place.
-          $search.css('margin-top', `-${scrollTopPixels}px`);
-          $menu.css('margin-top', `${menuTopMargin}px`);
-          $menu.css('max-height', `calc(100% - ${menuHeightOffset_fixed}px)`);
-        }
-        else {
-          // Between the top of the page and the threshold we calculate intermediate values
-          // to guarantee a smooth transition.
-          $search.css('margin-top', `-${currentScroll}px`);
-          $menu.css('margin-top', `${menuTopMargin + (scrollTopPixels - currentScroll)}px`);
-
-          if (currentScroll > 0) {
-            const scrolledPercent = (scrollTopPixels - currentScroll) / scrollTopPixels;
-            const offsetValue = menuHeightOffset_fixed + menuHeightOffset_diff * scrolledPercent;
-            $menu.css('max-height', `calc(100% - ${offsetValue}px)`);
-          } else {
-            $menu.css('max-height', `calc(100% - ${menuHeightOffset_default}px)`);
-          }
-        }
-      };
-
-      // The sidebar scroll event handler.
-      // Executed as the sidebar is scrolled as well as after the main scroll. This is needed
-      // because the main scroll can affect the scrollable area of the sidebar.
-      const handleSidebarScroll = () => {
-        const menuElement = $menu.get(0);
-        const menuScrollTop = $menu.scrollTop();
-        const menuScrollBottom = menuElement.scrollHeight - (menuScrollTop + menuElement.offsetHeight);
-
-        // As the navigation is scrolled we add a shadow to the top bar hanging over it.
-        if (menuScrollTop > 0) {
-          $search.addClass('fixed-and-scrolled');
-        } else {
-          $search.removeClass('fixed-and-scrolled');
-        }
-
-        // Near the bottom we start moving the sidebar banner into view.
-        if (menuScrollBottom < ethicalOffsetBottom) {
-          $ethical.css('display', 'block');
-          $ethical.css('margin-top', `-${ethicalOffsetBottom - menuScrollBottom}px`);
-        } else {
-          $ethical.css('display', 'none');
-          $ethical.css('margin-top', '0px');
-        }
-      };
-
-      $search.addClass('fixed');
-      $ethical.addClass('fixed');
-
-      // Adjust the inner height of navigation so that the banner can be overlaid there later.
-      const ethicalOffsetBottom = $ethical.height() || 0;
-      if (ethicalOffsetBottom) {
-        $menuPadding.css('height', `${ethicalOffsetBottom}px`);
-      } else {
-        $menuPadding.css('height', `0px`);
-      }
-
-      $window.scroll(function() {
-        handleMainScroll(window.scrollY);
-        handleSidebarScroll();
-      });
-
-      $menu.scroll(function() {
-        handleSidebarScroll();
-      });
-
-      handleMainScroll(window.scrollY);
-      handleSidebarScroll();
-    } else {
-      // Entering the "mobile" state.
-
-      $window.unbind('scroll');
-      $menu.unbind('scroll');
-
-      $search.removeClass('fixed');
-      $ethical.removeClass('fixed');
-
-      $search.css('margin-top', `0px`);
-      $menu.css('margin-top', `0px`);
-      $menu.css('max-height', 'initial');
-      $menuPadding.css('height', `0px`);
-      $ethical.css('margin-top', '0px');
-      $ethical.css('display', 'block');
-    }
-  };
-})();
-
-// Subscribe to DOM changes in the sidebar container, because there is a
-// banner that gets added at a later point, that we might not catch otherwise.
-const registerSidebarObserver = (function(){
-  return function(callback) {
-    const sidebarContainer = document.querySelector('.wy-side-scroll');
-
-    let sidebarEthical = null;
-    const registerEthicalObserver = () => {
-      if (sidebarEthical) {
-        // Do it only once.
-        return;
-      }
-
-      sidebarEthical = sidebarContainer.querySelector('.ethical-rtd');
-      if (!sidebarEthical) {
-        // Do it only after we have the element there.
-        return;
-      }
-
-      // This observer watches over the ethical block in sidebar, and all of its subtree.
-      const ethicalObserverConfig = { childList: true, subtree: true };
-      const ethicalObserverCallback = (mutationsList, observer) => {
-        for (let mutation of mutationsList) {
-          if (mutation.type !== 'childList') {
-            continue;
-          }
-
-          callback();
-        }
-      };
-
-      const ethicalObserver = new MutationObserver(ethicalObserverCallback);
-      ethicalObserver.observe(sidebarEthical, ethicalObserverConfig);
-    };
-    registerEthicalObserver();
-
-    // This observer watches over direct children of the main sidebar container.
-    const observerConfig = { childList: true };
-    const observerCallback = (mutationsList, observer) => {
-      for (let mutation of mutationsList) {
-        if (mutation.type !== 'childList') {
-          continue;
-        }
-
-        callback();
-        registerEthicalObserver();
-      }
-    };
-
-    const observer = new MutationObserver(observerCallback);
-    observer.observe(sidebarContainer, observerConfig);
-  };
-})();
-
-$(document).ready(() => {
-  const mediaQuery = window.matchMedia('only screen and (min-width: 769px)');
-
-  registerOnScrollEvent(mediaQuery);
-  mediaQuery.addListener(registerOnScrollEvent);
-
-  registerSidebarObserver(() => {
-    registerOnScrollEvent(mediaQuery);
-  });
-
-  // Load instant.page to prefetch pages upon hovering. This makes navigation feel
-  // snappier. The script is dynamically appended as Read the Docs doesn't have
-  // a way to add scripts with a "module" attribute.
-  const instantPageScript = document.createElement('script');
-  instantPageScript.toggleAttribute('module');
-  /*! instant.page v5.1.0 - (C) 2019-2020 Alexandre Dieulot - https://instant.page/license */
-  instantPageScript.innerText = 'let t,e;const n=new Set,o=document.createElement("link"),i=o.relList&&o.relList.supports&&o.relList.supports("prefetch")&&window.IntersectionObserver&&"isIntersecting"in IntersectionObserverEntry.prototype,s="instantAllowQueryString"in document.body.dataset,a="instantAllowExternalLinks"in document.body.dataset,r="instantWhitelist"in document.body.dataset,c="instantMousedownShortcut"in document.body.dataset,d=1111;let l=65,u=!1,f=!1,m=!1;if("instantIntensity"in document.body.dataset){const t=document.body.dataset.instantIntensity;if("mousedown"==t.substr(0,"mousedown".length))u=!0,"mousedown-only"==t&&(f=!0);else if("viewport"==t.substr(0,"viewport".length))navigator.connection&&(navigator.connection.saveData||navigator.connection.effectiveType&&navigator.connection.effectiveType.includes("2g"))||("viewport"==t?document.documentElement.clientWidth*document.documentElement.clientHeight<45e4&&(m=!0):"viewport-all"==t&&(m=!0));else{const e=parseInt(t);isNaN(e)||(l=e)}}if(i){const n={capture:!0,passive:!0};if(f||document.addEventListener("touchstart",function(t){e=performance.now();const n=t.target.closest("a");if(!h(n))return;v(n.href)},n),u?c||document.addEventListener("mousedown",function(t){const e=t.target.closest("a");if(!h(e))return;v(e.href)},n):document.addEventListener("mouseover",function(n){if(performance.now()-e<d)return;const o=n.target.closest("a");if(!h(o))return;o.addEventListener("mouseout",p,{passive:!0}),t=setTimeout(()=>{v(o.href),t=void 0},l)},n),c&&document.addEventListener("mousedown",function(t){if(performance.now()-e<d)return;const n=t.target.closest("a");if(t.which>1||t.metaKey||t.ctrlKey)return;if(!n)return;n.addEventListener("click",function(t){1337!=t.detail&&t.preventDefault()},{capture:!0,passive:!1,once:!0});const o=new MouseEvent("click",{view:window,bubbles:!0,cancelable:!1,detail:1337});n.dispatchEvent(o)},n),m){let t;(t=window.requestIdleCallback?t=>{requestIdleCallback(t,{timeout:1500})}:t=>{t()})(()=>{const t=new IntersectionObserver(e=>{e.forEach(e=>{if(e.isIntersecting){const n=e.target;t.unobserve(n),v(n.href)}})});document.querySelectorAll("a").forEach(e=>{h(e)&&t.observe(e)})})}}function p(e){e.relatedTarget&&e.target.closest("a")==e.relatedTarget.closest("a")||t&&(clearTimeout(t),t=void 0)}function h(t){if(t&&t.href&&(!r||"instant"in t.dataset)&&(a||t.origin==location.origin||"instant"in t.dataset)&&["http:","https:"].includes(t.protocol)&&("http:"!=t.protocol||"https:"!=location.protocol)&&(s||!t.search||"instant"in t.dataset)&&!(t.hash&&t.pathname+t.search==location.pathname+location.search||"noInstant"in t.dataset))return!0}function v(t){if(n.has(t))return;const e=document.createElement("link");e.rel="prefetch",e.href=t,document.head.appendChild(e),n.add(t)}';
-  document.head.appendChild(instantPageScript);
-});
diff --git a/doc/conf.py b/doc/conf.py
index c04e880a8d2..e7c8239cc88 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -218,7 +218,6 @@ linkcheck_anchors = False
 def setup(app):
     # theme customizations
     app.add_css_file("css/custom.css")
-    app.add_js_file("js/custom.js")
     app.add_js_file("js/dark-mode-toggle.min.mjs", type="module")
 
     app.add_js_file("https://www.googletagmanager.com/gtag/js?id=UA-831873-47")