Fixes:
- admin: fix cache clean views erroring
- admin: remove old admin overview
- admin: separate overview API into WorkerAPI and VersionAPI
- api: create dedicated api for cached flows and policies
- flows: fix inconsistent behaviour when flow is empty
- outposts: fix incorrect timeout for state cache
- web: re-organise sidebar
- web: rewrite aggregate cards to separate components
- web: use colours for icons, move users to separate card
- web: fix overview missing several cards