Setup meta issue

[dfabulich]

There are a lot of different bugs in setup that prevent setup from succeeding on a fresh UTM machine. This is a meta issue to track them.

• skip doctor fails for lack of xcodebuild on fresh install #205
  • Documented in doc PR 22 below
  • doctor: Print xcode-select hint if active dev dir is CommandLineTools #180
• skip doctor/skip checkup doesn't attempt to connect to the Android emulator #186
  • Warn when skip doctor/skip checkup can't find any attached devices #196
  • Documented in doc PR 22 below
• skip android emulator list fails on fresh install #188
  • Documented in doc PR 22 below
• Once the PRs have merged, we need to push a Skip release
• After releasing the fixes, we need to update the documentation
  • Setup fixes skip.dev#22 fixes:
    • Document installing iOS platform support skip.dev#19
    • Document running xcode-select skip.dev#21