make site with jekyll for htmlhint.io

[Polarpi]

Is your feature request related to a problem? Please describe.
Currently, htmlhint.io redirects to the github wiki. For example, the "about" button in the nav bar takes you to https://github.com/htmlhint/HTMLHint/wiki/About

Describe the solution you'd like
We want all the markdown documents and information to be on the site!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.