Separate tabs into pages

[anbraten]

The tabs used in the admin settings are currently loading a single page and therefore when entering the admin settings the complete data like secrets, registries, agents, users, ... is loaded at one.

• Instead I suggest splitting that page into multiple pages. One page per tab.
• In addition it would be nice to separate the details / edit components like secret edit into separate pages as well having an own url

[qwerty287]

That's on my personal refactoring to do list for a while already. It's the same for repo, org and user settings.

[qwerty287]

And it's a similar issue for editing/adding secrets, registries, crons, users… They should have their own URL too