GitHub action update for preview and contribution workflow

[zacharyDez]

What changed

• Integrates changes to our CI/CD pipeline to only run preview deployments on PR from staging to main. 🔑
• Typo fixes from @tylere 🙏

Fixes #74

How to test it

• Visit the preview
• Checkout the GitHub action logs

[github-actions[bot]]

PR Preview Action v1.4.4 :---: :rocket: Deployed preview to https://cloudnativegeo.github.io/cloud-optimized-geospatial-formats-guide/pr-preview/pr-87/ on branch gh-pages at 2023-10-30 16:42 UTC