feat: addition of docusaurus powered arcus documentation website

[THMKAE]

Types of changes

What types of changes does your code introduce to the Arcus Testing repo? Put an x in all the boxes that apply:

• [x] New feature (non-breaking change which adds functionality)
• [x] Documentation Update (if none of the other choices apply)

Checklist:

🚨 Before submitting this PR, please make sure:

• [x] Your code follows the code style of this project
• [x] Your code builds clean without any errors or warnings
• [x] You have linted and formatted your code locally prior to submission

Proposed changes

This PR adds the docusaurus implementation to the Arcus Testing repository. Removes all Jekyll config files Versioning is also implemented Uses the latest version of docusaurus Does require to use Node.js +18 (using 18.17.1 myself)

Further comments

It still requires the Netlify configuration It does not run a custom sidebar items (capitalize) transformer as this gave issues, but all pages and titles seem to look alright.

Screenshots (if appropriate)

[stijnmoreels]

Great work @THMKAE ! Thx for this. Wondering if the search capabilities also needs work? Or can this only be added once we get the Netlify running? (We can activate that once this is on main).