Updated Run Scripts, Instructions, and README To Assist In Working With Setting Up The Wiki

[OrsellGit]

This PR isn't as big as I wanted, but at least it is one step closer to better documentation by explaining how to use the provided wiki repository to get started documenting Strata Source.

Changes:

• Added the other game-specific notices into the contribution notices page, as they were hidden in the "Test suite" section of the Wiki.
• The previous version of the run script required running npm run build before running the run script, which would call npm run dev. This has been fixed, nix run build will always be run before npm run dev.
• The script will now make sure to update the Wiki source repository named "site" whenever it starts to make sure the latest source code is used.
• Added a README that was ported/transferred from the StrataSource/strata-wiki repository. That one in turn has been replaced and directs people to the StrataSource/Wiki README instead. There is a PR for that also: Replaced Current README With A New Redirecting One strata-wiki#90
• Added a new section to the "Getting Started" Wiki page, directing people to clone the Wiki documentation repository so they can make edits locally.

This should be it for now. There will be more to come from me in the future. But at least the process for getting started with local Wiki documentation is now more transparent.