docs: added example upload store cache with Nginx

users: updated UI for advanced section. Mostly fixes arround making clearer UI for detaching/deleting dependent objects of user.

search: make better use of search tags - add global tag which can widen the search results

api: pull-requests get_all now sortes the results and have a flag to show/hide merge result state

diffs: fixed case of bogus files diff rendering - adds safe placehodler so we never crush more in this cases at it's 2nd time this happens - fixes #5528 - references #5422

quick-search: improve styling of search input and results.

search: new UI for search, and repo group context search - expose search into main NAV - have repo group search filter using new ES lang - show token keys and curretn context when searching - ui updated and consistency fixes

search: add option to search within a repository group.

ui: expose search as a visible option for repositories.

security: fix possible XSS in the issue tracker URL.