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.

• [X] Scalastyle rules and rule repository #378
• [x] Scapegoat rules and rule repository #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 (https://github.com/mwz/sonar-scala/issues/87 - https://github.com/sksamuel/scapegoat/issues/219).