[nav-qol] Add instant loading for the website (#751)

The entire site loads as an PWA, without refreshing
which feels more modern. It uses XHR in the backend
to fetch the pages.

Signed-off-by: black-dragon74 <niryadav@redhat.com>

mkdocs.yml

@@ -12,6 +12,7 @@ theme:
   name: material
   favicon: images/favicon.ico
   features:
+    - navigation.instant
     - navigation.tracking
   palette:
     - scheme: slate