The page at https://alphagov.github.io/open-standards/ is broken because
it can't load the CSS from tech-and-data-standards (and github doesn't redirect
from renamed repos in pages), so this PR should fix that be allowing it to be
loaded from open-standards/css/main.css
Fixes the baseurl for the generated page
The page at https://alphagov.github.io/open-standards/ is broken because it can't load the CSS from tech-and-data-standards (and github doesn't redirect from renamed repos in pages), so this PR should fix that be allowing it to be loaded from open-standards/css/main.css