Integration READMEs code block sweep 🧹

[delucis]

Changes

Quick sweep through integration READMEs to fix up some code blocks

Includes:

• Fix an unclosed code block in Tailwind README.
• Move titles to comments instead of custom title="" attribute to make that context available on GitHub/npm (including updating any line number annotations to take this into account).
• Rework Netlify example to avoid reliance on ins/del annotations that won’t work outside of the docs site.
• Rework a Deno example for the same reason.
• A couple other small fixes.

Testing

Docs only.

Docs

Docs only /cc @withastro/maintainers-docs for feedback!

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Latest commit: 7bbc8ca

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[sarah11918]

These all look great, @delucis, thanks!