Migrate documentation to new website

[AesaraB]

Documentation source

No response

Documentation issue

There are a number of markdown files in the root directory, making the directory cluttered.

Documentation suggestions

The following files may be moved to the website:

• [x] BUILDING.md
  • Removed in mypaint/mypaint#1241
• [x] CODE_OF_CONDUCT.md
  • Removed in mypaint/mypaint#1241
• [x] DEBUGGING.md
  • Removed in mypaint/mypaint#1247
• [ ] Changelog.md
  • This is a tricky one, as we want this file to be up to date, but moving it to the website adds a layer of abstraction for contributors.
• [ ] References to github wiki
  • Apparently this is embedded in the code, e.g. pages the wiki say "Do not rename this page. It is linked to from within the program."

    MyPaint version

git/master

Code of Conduct

• [X] I acknowledge that my conduct contributes to shaping the community.

[jtojnar]

• [ ] Changelog.md

Traditionally, it is part of the tarball. But we could probably fill it in at dist time.

• [ ] References to github wiki

  • Apparently this is embedded in the code, e.g. pages the wiki say "Do not rename this page. It is linked to from within the program."

Yeah, unfortunately, we will need to keep the wiki for the foreseeable future and replace the page contents with links to the website, since it does not allow us to do redirects.