Description

Cleaned up root README.
- Added note pointing to games-standalone repository to avoid confusion.
- Updated the Eggs list to be a simple list without duplicate names taking up space.
- Fixed Egg name typos.
- Added Eggs missing from list.
- Rebranded Garry's Mod egg to be a "fork" rather than a "rework".
Updated LICENSE year.
Updated CONTRIBUTING to have corrected hyperlinks (still contains references to Pterodactyl docs and eggs/scripts folder though).

Checklist for all submissions

[x] Have you followed the guidelines in our Contributing document?
[x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
[x] Have you tested and reviewed your changes with confidence that everything works?
[x] Did you branch your changes and PR from that branch and not from your master branch?