[bug#69783] [PATCH v2] website: Convert old style sheets into a theme.

[pelzflorian (Florian Pelz)]

Having pushed these two patches to guix-artwork and guix.git, I have one
humble request to the Guix maintainers (Cc):

This patch split static/ into static/ and themes/.  Could someone with
push access to maintenance.git make it so that hydra/nginx/berlin.scm
also emits cache HTTP headers for themes/ like it already does for
static/?

Pushed as f916cbb234e159f4730425c82d436a542f9288a8 with two changes:
* untabified,
* changed the static/base/fonts in .guix.scm as well.

Otherwise all rebuilds are automatic, I believe, and I hope we have not
wreaked much havoc.

Regards,
Florian