Add Zed extension (#936)

Add link to the Zed extension under community supported section

Author: nerdalytics

pages/docs/manual/latest/editor-plugins.mdx

@@ -17,3 +17,4 @@ We don't officially support these; use them at your own risk!
 - [Neovim Tree-sitter](https://github.com/nkrkv/nvim-treesitter-rescript)
 - [IDEA](https://github.com/reasonml-editor/reasonml-idea-plugin)
 - [Emacs](https://github.com/jjlee/rescript-mode)
+- [Zed](https://github.com/humaans/rescript-zed)