* Add class to page content to unify top margin
Previously pages would individually set this margin but some didn't so
content would stick to the header without any space. Resolve this by
adding a new class that is added on all pages. The only place where we
remove this margin again is on the pages with menu or wrapper in the
header.
* fix admin notices
* fix team pages
* fix loading segment on gitgraph for arc-green
* fix last missing case
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Partially implement #770.
Add "Default Webhooks" page in site admin UI.
Persist to the existing webhooks table, but store with RepoID=0 and OrgID=0.
Upon repo creation, copy the set of default webhooks into the new repo.
