Export all inspections into a json file

[mwz]

We should export all of the rules from our rule repositories and quality profiles into a json format which then could be used on the website.
I'd like to create something similar to this rule search interface for sonar-scala rules.

• Scalastyle rules and rule repository WIP Refactor generating rules and rule repositories #378
• Scapegoat rules and rule repository Refactor scapegoat rules and repositories #383
• Scalastyle quality profile
• Scapegoat quality profile
• Scalastyle+Scapegoat quality profile
• Recommended by sonar-scala quality profile

[mwz]

This is what it looks like so far https://sonar-scala.com/docs/rules/scalastyle.
Sorting out Scapegoat descriptions is next on my list (#87 - scapegoat-scala/scapegoat#219).