Transfer from Wiki

[GeckoEidechse]

• [x] Initial Wiki merge -> 9c3ee013433cf02e7c2901677dc5b78fd48a24d7
• [x] Fix broken image links -> #63
• [x] #65
• [x] Fix broken header links -> #68
• [x] Change GitBook specific Markdown syntax to mkdocs syntax
  • [x] #64
  • [x] External link embeds
    • [x] #81
    • [x] #82
  • [x] YouTube videos
    • [x] #83
    • [x] #84
  • [x] Internal link embeds -> #86
• [ ] Import currently open
  • [ ] PRs
  • [x] Issues
• [x] Update links everywhere to point to new docs
  • [x] Docs -> #100
  • [x] Website
  • [x] Discord
  • [x] Discord bots
    • [x] Ticketbot tags
    • [x] Reaper -> https://github.com/R2NorthstarTools/Reaper/pull/64
• [x] Add deprecation notice to old wiki -> https://github.com/R2Northstar/NorthstarWiki/pull/310

Related: #8