[CAL-93] refactor link based apps and move them into packages/app-store

[PeerRich]

right now we have

• [ ] around
• [ ] riverside
• [ ] whereby

as link-based video conferencing apps and their code is spread out into all kinds of different files making it hard to maintain and add more link-based services.

to add a new link-based video service, you need to touch

• [ ] components/dialog/EditLocationDialog.tsx
• [ ] pages/event-types/[type].tsx
• [ ] en/common.json (translations)
• [ ] packages/app-store/locations.ts

a refactor would move all of these into /app-store and read based on the file structure whats a location and whats not