server.scss for login pages

[GitHubUser4234]

Hi,

Since NC 13 the "Renew Password" page for LDAP users doesn't load the server.scss anymore.

Talked with @juliushaertl who kindly helped to shed some light on this: As the guest template is also used by the maintenance/install page, it isn't sure whether database/caching is ready there, so the SCSSCacher from the server cannot be used, only plain CSS would do. Maybe in NC 14 it would be possible to add a separate template for other pages that are accessed in guest mode, like login pages and the foresaid "Renew Password" page.

[juliusknorr]

That would also fix #9246

[skjnldsv]

Related #15584