GitLab

- Resolve provider name on hidden input
- Hide signup methods on form submission

Factor out trigger_sync() as lock_sync() to be used for other
sync processes in addition to sync_projects().
Implement sync_users(), which registers users and their quotas.
Use both sync processes in astakos-qh-sync management command.

Needed for building devflow packages from feature-projects.

- New landing page (missing icons)
- Auth methods js bug fixes
- Style fixes

Dummy check, forced by bug in builtin `isatty` method:
https://bugzilla.redhat.com/show_bug.cgi?id=841152