update sync testing in order to avoid affecting production

Author: daquinteroflex

.github/workflows/sync-to-readthedocs-repo.yaml

@@ -47,7 +47,7 @@ jobs:
         run: |
           git fetch --unshallow origin ${{ needs.extract_branch_or_tag.outputs.ref_name }}
           git pull origin ${{ needs.extract_branch_or_tag.outputs.ref_name }}
-          git remote add mirror https://github.com/flexcompute-readthedocs/tidy3d-docs.git
+          git remote add mirror https://github.com/flexcompute-readthedocs/tidy3d-docs-demo.git
           git push mirror ${{ needs.extract_branch_or_tag.outputs.ref_name }} --force # overwrites always
         env:
           GITHUB_TOKEN: ${{ secrets.GH_PAT }}
@@ -66,7 +66,7 @@ jobs:
       - name: Push corresponding reference to mirror repo if a tag
         if: contains(github.ref, 'refs/tags/')
         run: |
-          git remote add mirror https://github.com/flexcompute-readthedocs/tidy3d-docs.git
+          git remote add mirror https://github.com/flexcompute-readthedocs/tidy3d-docs-demo.git
           git push mirror ${{ needs.extract_branch_or_tag.outputs.ref_name }} --force # overwrites always
         env:
           GITHUB_TOKEN: ${{ secrets.GH_PAT }}