[x] My pull request has a descriptive title (not a vague title like Update index.md)
This PR adds the MathJax 3.2.2 script (served by the fCC CDN) to Ghost or Hashnode served posts that have a "MathJax" tag. These changes will allow authors to use the MathJax block in the Hashnode editor. They will also allow us to remove injected scripts from posts on Ghost, and begin converting equations / formulas in articles that use other math typesetting libraries like KaTeX into MathJax for migration.
Checklist:
Update index.md)This PR adds the MathJax 3.2.2 script (served by the fCC CDN) to Ghost or Hashnode served posts that have a "MathJax" tag. These changes will allow authors to use the MathJax block in the Hashnode editor. They will also allow us to remove injected scripts from posts on Ghost, and begin converting equations / formulas in articles that use other math typesetting libraries like KaTeX into MathJax for migration.