Document status of x64 macOS support

[mattwthompson]

Closes #78

• Communicate that x64 macOS support is limited by upstreams
• Give rough dates on AmberTools issues
• Recommend osx-arm64 when available
• Mention building AmberTools from source
• Mention NAGL as a replacement

[github-actions]

This repository caches data generated from notebooks stored in other repositories in the _cookbook_data_* branches. Regenerating this cache takes about half an hour, so it is not done automatically in PRs. The current value of the cache from the main branch has been copied over to this PR's cache.

To regenerate the cache for this PR, create a comment on this PR consisting only of the string:

/regenerate-cache

[mattwthompson]

/regenerate-cache

[github-actions]

A workflow has been dispatched to regenerate the cookbook cache for this PR.

• Run ID: 13254167698
• Triggering actor: github-actions[bot]
• Target branch: doc-78
• Deployment branch: _cookbook_data_PR79

[github-actions]

A workflow dispatched to regenerate the cookbook cache for this PR has just finished.

• Run ID: 13254167698
• Triggering actor: github-actions[bot]
• Target branch: doc-78
• Deployment branch: _cookbook_data_PR79
• Job status: success
• Notebooks status: 31 / 31 notebooks successfully executed (0 failures ignored)

• Failing notebooks:

  • [ignored]

Changes will only be visible in the ReadTheDocs preview after it has been rebuilt.

[Yoshanuikabundi]

Thanks for this Matt! This is great info. One nit re: the use of "Fall"