Move the kernel documentation up and make it a main chapter. Right now
it is hidden very low in the structure under references.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Move guides and APIs into separate directories and cleanup naming
introducing index files rather than named section files.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Instead of having kernel APIs documentated in a separate page, move the
API references to the object pages and have everything in one place.
Remove the intermediate category page and list all section under the
kernel directly.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
