Move docs into the repository

[pavithraes]

Is your feature request related to a problem? Please describe.

Using GitHub wiki for docs doesn't allow us to have "reviews" in the documentation contribution workflow.

Describe the solution you'd like

Move the wiki pages into the repository as markdown files, and create an action that moves text over to the wiki. This means we'll treat the wiki as a read-only space.

This also allows us to have linting and testing to ensure consistency.

Describe alternatives you've considered

A docs website is the ideal solution, but is currently not do-able. However, having docs in the repo will allow easier transition to a docs generator if/when that happens.

Additional context

This was discussed with @ptomecek and @robambalu in a meeting today.

Next steps:

• Move the documentation as-is into the repo
• Give attribution fairly - add everyone who originally authored the docs as co-authors on the PR
• Add automation action