Remove unused workflows which have been replaced by the GitHub pages deployment workflow

[janechu]

Pull Request

📖 Description

This change removes the now unused workflows to deploy the documentation site to azure. We now have a workflow to deploy to github pages instead.

✅ Checklist

General

• [ ] I have included a change request file using $ yarn change
• [ ] I have added tests for my changes.
• [ ] I have tested my changes.
• [ ] I have updated the project documentation to reflect my changes.
• [x] I have read the CONTRIBUTING documentation and followed the standards for this project.

⏭ Next Steps

• Publish @microsoft/fast-element v2
• Switch the DNS to point to GitHub pages