Issue with dev doc builds, fonts

I noticed that a local website style build of the Postgres docs looked
odd. Chrome's console revealed that there was some issue with
downloading fonts.

Attached are errors from Chrome's console. There is a 404 error for
the URL  https://www.postgresql.org/media/css/bootstrap.min.css.map,
plus something about a CORS policy.

Thanks
-- 
Peter Geoghegan