configurable header / footer links for GDPR (DSVGO) compliance of self hosted gitlabs
Description
You've probably all heard of the changes the GDPR (DSVGO in German) brings. At least in Germany the recommendation of many lawyers is that every single page should contain a direct link to the "privacy policy & legal notice" ("Datenschutzerklärung & Impressum"). However, in a self hosted gitlab there currently is no way for admins to easily add such links to a header or footer that is shown to all (logged in and anonymous) users on each page (including public repos without logging in). In the current fear of lawyers specializing on cease and desist letters, this is a pressing issue for many universities and research groups.
Proposal
I'd first propose to introduce the ability for admins to add such an additional link (similarly to the configurable "Help" page) to the whole instance.
Second, (optional, but awesome) it would help a lot to already have a GDPR conform template in there (similar to the pre-filled help page), cause it's similar across all self hosted gitlab instances and unlike individual admins, the community and gitlab as a company probably knows best how personal data is processed.