Remove some examples

[bluwy]

Changes

Removes:

• middleware
• non-html-pages
• server-islands
• view-transitions
• with-markdown-plugins (docs already has examples)
• with-markdown-shiki (already the default)

Most of these examples are created while developing the feature. Now they're common enough that I think users are better off referencing the docs for up-to-date information instead.

I did not remove:

• container-with-vitest (since it's still experimental, it's still useful to have its own example for testing)
• ssr (has quite an amount of useful code. i think it can be cleaned up in the future to not rely of svelte as its framework specific)
• framework-lit (we still support it in astro 4, so not removing for now)

With this PR that removes 6 examples, it brings down our templates count from 31 to 25. Let me know if you disagree with removing an example, I'm happy to revert/discuss it.

Testing

n/a

Docs

n/a

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