refactor: add list-hosts module for reuse
add web apge to show added apps

goto `localhost`, `index.ka` and `katon.ka` will see it.
Merge remote-tracking branch 'origin/master' into feature/web-page
Merge remote-tracking branch 'origin/master' into feature/web-page
Merge pull request #38 from wcp1231/feature/web-page

Feature/web page