- Rename doom-docs--display-header-h -> doom-docs--display-menu-h to
better represent what it does.
- Add comments to describe the purpose of lib/docs, and TODO annotations
to hint at its future and remind me later.
I've omitted docs/*.org from this merge, as there is still work left to
do there, but I am pushing the module docs early so folks can benefit
from the new docs sooner.
