fix(user): Split talk user documentation into pieces

[nickvergessen]

Rewriting and polishing

Info / Templates to use https://gitlab.com/tgdp/templates

• Samples:
  • https://www.bycs.de/hilfe-und-tutorials/videokonferenzsystem/index.html
  • https://support.bigbluebutton.org/hc/en-us/categories/1500000517381-BigBlueButton-HTML5
  • https://jitsimeet.eu/hilfe/
  • https://support.microsoft.com/de-de/teams (Overview is not good, but details afterwards are)

---

• Chat
  • Sending messages
  • Interacting with messages
  • Apps integrating with messages
  • Attachments
• Conversations
  • Conversations
  • Open Conversations
  • Federation
  • Files integration
• Calls @miaulalala
  • Call
  • Call recording
  • Webinar
  • Breakout rooms
• Join a call or chat as guest
  • Joining a chat
  • Joining a call
  • Starting a screen share
  • More settings

[nickvergessen]

Just to have it noted, in the team week when speaking about this, we agreed that we should also look into "usecase splitting", basically have clear entry pages for Moderators and Participants so they can learn/see only the bits they need.

[DorraJaouad]

• Rebased
• Added the new features that were added in two main files

The new placements are discussable ofc