nicer diff highlighting

[Rich-Harris]

• implement inline highlights of shiki'd code
• convert all existing diff blocks
• error on encountering a diff block (all diffs should use the inline form)
• follow-up: delete the tutorial markdown rendering logic and use render_content instead

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
omnisite	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 12, 2024 3:32am

[Rich-Harris]

This has been nightmarishly complicated but I'm very happy with the change. The diffs are clearer and better looking, and we retain syntax highlighting, tooltips, and the ability to toggle between JS and TS

[Rich-Harris]

(Oh and by not running Prettier we get more faithful conversions; often there's no change and we don't even need to bother having the two separate blocks)