Merge branch 'dev'

* dev:
  release v0.5.8
  command pdf add osx support
  typofixed
Merge branch 'dev'

* dev:
  add pdf link to index doc
  update docs
  watch help
  typofix
  update Readme and changes
  typofixes
  remove testing line
  add option <port> to command `start`, `serve`
update doc theme `rux`
update docs theme
0.6.0 Alpha version