Todo ~~before~~ after v9 nuget push

[Thraka]

• [x] Investigate and fix #258 (ProcessMouse with a BorderConsole)
• [x] Update versions
• [ ] Documentation
  • [x] Update the API with latest build
  • [x] Create getting started content
  • [ ] Migrate the 4-part starter series
  • [ ] Port basic conceptual material from v8
• [x] Update MigrationNotes.txt to finish todo in there and clean up