chore: move landing-page to separate repo

[birkskyum]

This moves the landing page over here:

https://github.com/solidjs/solid-start-landing-page

[changeset-bot]

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Latest commit: 522bc64

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[pkg-pr-new]

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• example-bare
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• example-todomvc
• example-with-auth
• example-with-authjs
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• example-with-solid-styled
• example-with-tailwindcss
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