move wiki pages

[giladgray]

• Release Process
• Development Practices
  • Coding Guidelines
• Build Tasks
• Editor integration
• Docs Development

• Update CONTRIBUTING.md

[llorca]

I moved what still made sense, most of these pages are quite out-of-date. Even the ones I moved still probably contain errors, though I tried to correct as much as possible.

Let's go over it quickly next week so we can close this task.

[llorca]

Everything we wanted to move over has moved. Last step is updating CONTRIBUTING.md 👍

[adidahiya]

The Releases & Artifacts wiki page is missing -- we should definitely port that over since it's linked at the top of the docs overview page :)