[GHA] Creating a new version only tracks relevant files to git

Fixes an issue where unrelated files could gettinget added to the `docusaurus-versions` branch. This broke GHA in the Ax repo since this was adding the results of running tutorials. Botorch doesn't run tutorials in CI but we still fix this to avoid other possible issues down the road.

.github/workflows/publish_website.yml

@@ -60,7 +60,7 @@ jobs:
         yarn
         yarn docusaurus docs:version ${{ inputs.new_version }}
 
-        git add --all
+        git add versioned_docs/ versioned_sidebars/ versions.json
         git commit -m "Create version ${{ inputs.new_version }} of site in Docusaurus"
         git push --force origin HEAD:docusaurus-versions
     - name: Build website