Create Wiki with documentation of rules and categories

[bvobart]

Currently, you have to run mllint list all and mllint describe some-slug to get information about a rule. It would be better if mllint's CI would auto-generate some content for a website on this repo at every release.

Idea:
- Implement generating Markdown version of Wiki page containing docs on every rule and category in mllint.
- Use this Wiki page creator action to generate a Wiki page from the mllint generated Markdown code.

Tasks:

• Look into and set up Github Pages
• Create a basic website (using Hugo)
• Find a good theme (PaperMod)
• Write some content for any other pages.
• Implement a script to generate Hugo content from rules & categories descriptions
• Set up CI pipeline to automatically deploy the website on pushes to master or on tagged releases.
• Update ReadMe with link to website.
• Merge to master