Add rainbow tree-sitter highlights

ref: helix-editor/helix#695
ref: helix-editor/helix#2857

Author: the-mikedavis

book/src/SUMMARY.md

@@ -25,3 +25,4 @@
   - [Adding textobject queries](./guides/textobject.md)
   - [Adding indent queries](./guides/indent.md)
   - [Adding injection queries](./guides/injection.md)
+  - [Adding rainbow bracket queries](./guides/rainbow_bracket_queries.md)

book/src/editor.md

@@ -49,6 +49,7 @@
 | `rulers` | List of column positions at which to display the rulers. Can be overridden by language specific `rulers` in `languages.toml` file | `[]` |
 | `bufferline` | Renders a line at the top of the editor displaying open buffers. Can be `always`, `never` or `multiple` (only shown if more than one buffer is in use) | `never` |
 | `color-modes` | Whether to color the mode indicator with different colors depending on the mode itself | `false` |
+| `rainbow-brackets` | Whether to render rainbow colors for matching brackets. Requires tree-sitter `rainbows.scm` queries for the language. | `false` |
 | `text-width` | Maximum line length. Used for the `:reflow` command and soft-wrapping if `soft-wrap.wrap-at-text-width` is set | `80` |
 | `workspace-lsp-roots` | Directories relative to the workspace root that are treated as LSP roots. Should only be set in `.helix/config.toml` | `[]` |
 | `default-line-ending` | The line ending to use for new documents. Can be `native`, `lf`, `crlf`, `ff`, `cr` or `nel`. `native` uses the platform's native line ending (`crlf` on Windows, otherwise `lf`). | `native` |