feat: support for searching code blocks

[chenjiahan]

Summary

This PR adds a new search.codeBlocks option.

If enabled, the search index will include code block content, which allows users to search code blocks.

import { defineConfig } from 'rspress/config';

export default defineConfig({
  search: {
    codeBlocks: true,
  },
});

Default value

This default value is false to align with other search engines like Docsearch, see: https://docsearch.algolia.com/docs/docsearch-program/#can-you-index-code-samples.

If it works well, we may consider enabling it by default in the future.

Related Issue

resolve #1543

Checklist

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

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[SoonIter]

why uses 'inlineTag' here

Is <code /> under expectation?

info: https://github.com/html-to-text/node-html-to-text/blob/master/packages/html-to-text/README.md

[chenjiahan]

All the built-it formats of html-to-text will preserve the <code> prefix.

I guess this is not bad, since it shows that the search results are from code blocks.

If you have time, you can try writing a custom formatter to remove <code> 😄