am 5cdadb48: initial shuffle of the API guide nav to add introduction * revise...

am 5cdadb48: initial shuffle of the API guide nav to add introduction * revise to the Compatibility doc, put it in Intro * put Permissions in Intro * put App Fundamentals in Intro * move Manifest docs to the top of side nav tree * move App Resources above UI Will perf

* commit '5cdadb48':
  initial shuffle of the API guide nav to add introduction * revise to the Compatibility doc, put it in Intro * put Permissions in Intro * put App Fundamentals in Intro * move Manifest docs to the top of side nav tree * move App Resources above UI Will perform another fix to the Best Practices section later to deprecate some docs there and point to Training instead