* Change look and feel of the `ansible-core` docs (#74200)
(cherry picked from commit d7f826c987)
* lighten navigation background to make section labels easier to read for core docs (#74356)
* make section labels for /ansible-core/ docs easier to read, with black text and lighter gray background
(cherry picked from commit 6119fb0a9a)
Co-authored-by: Sandra McCann <samccann@redhat.com>
