Addon-docs: Upgrade to MDXv2

[shilman]

Issue: #14603

What I did

• Upgrade to MDX2 across the board
• Deleted broken mdx-to-csf codemod, which will be replaced Migration for transforming .stories.mdx into .mdx + .csf #19497
• Fix misc minor issues

Self-merging @tmeasday

How to test

• CI passes

[github-actions]

	Fails
🚫	PR is marked with "BREAKING CHANGE" label.

Generated by 🚫 dangerJS against 75759c1

[socket-security]

Socket Security Report

👍 No new dependency issues detected in pull request

Socket.dev scan summary

Issue	Status
Did you mean?	✅ no new possible package typos
Install scripts	✅ no new install scripts
Telemetry	✅ no new telemetry
Troll package	✅ no new troll packages
Malware	✅ no new malware
Native code	✅ no new native modules

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