feat: move social share buttons below content

Also, add page_footer.html to help make page footers more consistent.

Close #1383

scripts/list_language_packs.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+# List Available Language Packs
+# Used for updating the Languages page of the documentation.
+# https://sourcethemes.com/academic/
+#
+# Prerequisites: pip3 install PyYAML
+
+import yaml
+
+LANG_PATH = Path(__file__).resolve().parent.parent.joinpath('data').joinpath('i18n')
+LANG_YAML = LANG_PATH.joinpath('languages.yaml')
+
+
+# Iterate over languages.
+with open(LANG_YAML) as f:
+  master_map = yaml.safe_load(f)
+
+  # Print languages as a plaintext list.
+  # lang_list = [master_map[master_item] for master_item in master_map]
+  # print(', '.join(lang_list))
+
+  # Print languages as a Markdown list.
+  for master_item in master_map:
+    print(f'- **{master_map[master_item]}** ({master_item})')