ReStructuredText (rst) Support in Zed

1st chunk of `docs/src/languages/rst.md`

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# ReStructuredText (rst)

ReStructuredText language support in Zed is provided by the community-maintained [reST extension](https://github.com/elmarco/zed-rst).
Report issues to: [https://github.com/elmarco/zed-rst/issues](https://github.com/elmarco/zed-rst/issues)

- Tree-sitter: [stsewd/tree-sitter-rst.git](https://github.com/stsewd/tree-sitter-rst.git)
- Language Server: [swyddfa/esbonio](https://github.com/swyddfa/esbonio)

Title: ReStructuredText (rst) Support in Zed

Summary

Zed supports the ReStructuredText (rst) language via the community-maintained reST extension. Issues should be reported to the extension's GitHub repository. The extension utilizes tree-sitter-rst for syntax parsing and esbonio as the language server.