Revert "CI: Add step to purge Cloudflare cache"

This reverts commit 5c382f1.

No longer applicable by disabling the page caching rule for
"everything".

.github/workflows/main.yml

@@ -55,8 +55,3 @@ jobs:
         projectName: ubuntu-mate-org
         directory: _site
         gitHubToken: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Purge Cloudflare Cache
-      if: ${{ github.event_name == 'push' && github.repository == 'ubuntu-mate/ubuntu-mate.org' && github.ref == 'refs/heads/master' }}
-      run: |
-        curl -X POST --fail-with-body https://api.cloudflare.com/client/v4/zones/${{secrets.CLOUDFLARE_ZONE_ID}}/purge_cache -H "Authorization: Bearer ${{secrets.CLOUDFLARE_API_TOKEN}}" -H "Content-Type: application/json" --data '{"purge_everything":true}'