Migrate `gt-font-*` to `tw-text-*` All tailwind-original class names are
also available and render like they would with 16px root font size.
We currently have root font size at 14px, but I would like to eventually
migrate us to 16px so that the tailwind docs apply to us unchangend and
because 16px is the recommended root font size for web pages in general.
Also the number 16 is much better dividable than 14 so will result in
more integers.
(cherry picked from commit 75e2e5c736687ae1897cf760a432b572feed56f5)
Conflicts:
templates/repo/header.tmpl
trivial context conflict
66feafb3de