chore: move documentation to readthedocs (#12360)

Signed-off-by: jmeridth <jmeridth@gmail.com>
Co-authored-by: Tim Collins <tim@thecollins.team>
Co-authored-by: Anton Gilgur <4970083+agilgur5@users.noreply.github.com>
(cherry picked from commit e921056)

.github/workflows/docs.yaml

@@ -18,8 +18,6 @@ permissions:
 jobs:
   docs:
     runs-on: ubuntu-latest
-    permissions:
-      contents: write # for publishing the docs to GH Pages
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
@@ -44,10 +42,3 @@ jobs:
           name: docs
           path: site
           if-no-files-found: error
-      - name: Publish to GH Pages (when on main)
-        if: github.repository == 'argoproj/argo-workflows' && github.ref == 'refs/heads/main'
-        uses: peaceiris/actions-gh-pages@v3
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_branch: gh-pages
-          publish_dir: ./site