Cleanup root

[Dr-Electron]

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

With the upcoming changes we should cleanup the wikis root so that it is easier for us and others to make needed changes

Describe the solution you'd like

Tasks

Beta Give feedback

1. Move plugins into src folder
2. Get rid of theme and move components to src folder
3. Get rid of tutorials, move content to docs and configure tutorial cards in a separate config file
4. Rename common folder to config and move all relevant configs there

[Dr-Electron]

If needed we should create sub folders for things like argo and so on.
Also the svgo config can probably removed. (@jlvandenhout said, that docusaurus might use similar parameters as they use svgo internally too)

[jlvandenhout]

As most part of the logic in theme and plugins is in Typescript, and Docusaurus v3 supports Typescript natively, I'm going to base these changes on the upgrade-to-v3 branch. I will push a small change there first, making the Docusaurus config file a Typescript file.

[jlvandenhout]

I converted the related PRs to draft, because we decided to target the main branch for now instead of the v3 upgrade. I'll rebase the PRs on main and resolve any remaining issues.