build(docs): Move static webapp config

[Josmithr]

Publishing step needs this config to live in the build output directory. Placing it under static ensures it is copied to the right place.

See Azure/static-web-apps#1071 for more details.

Confirmed that the swa-cli is able to find this when run locally. This is also how the site was setup previously, I was just misled by the documentation leading me to believe that moving it to the root was okay. It also worked using the local swa-cli tooling 🤷‍♂️

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  171747 links
    1640 destination URLs
    1840 URLs ignored
       0 warnings
       0 errors