docs: init website structure

[Timeless0911]

Summary

The basic structure of Rslib website.

Related Links

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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CodSpeed Performance Report

Merging #305 will not alter performance

_{Comparing docs/structure (f9db274) with main (b448c80)}

Summary

✅ 5 untouched benchmarks

[fi3ework]

We are not in a hurry to complete the Chinese document. We can wait until the English document reaches a certain level of completion and is close to being stable before we start focused translation.

[Timeless0911]

LibConfig should be put into one html instead of multiple html pages, we can continue to write different mdx for each config and import them all in a index page.