docs: migrate to mdbook

docs/src/cli/highlight.md

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+# `tree-sitter highlight`
+
+You can run syntax highlighting on an arbitrary file using `tree-sitter highlight`. This can either output colors directly
+to your terminal using ANSI escape codes, or produce HTML (if the `--html` flag is passed). For more information, see
+[the syntax highlighting page](../3-syntax-highlighting.md).
+
+```bash
+tree-sitter highlight [OPTIONS] [PATHS]... # Aliases: hi
+```
+
+## Options
+
+### `-H/--html`
+
+Output an HTML document with syntax highlighting.
+
+### `--css-classes`
+
+Output HTML with CSS classes instead of inline styles.
+
+### `--check`
+
+Check that the highlighting captures conform strictly to the standards.
+
+### `--captures-path <CAPTURES_PATH>`
+
+The path to a file with captures. These captures would be considered the "standard" captures to compare against.
+
+### `--query-paths <QUERY_PATHS>`
+
+The paths to query files to use for syntax highlighting. These should end in `highlights.scm`.
+
+### `--scope <SCOPE>`
+
+The language scope to use for syntax highlighting. This is useful when the language is ambiguous.
+
+### `-t/--time`
+
+Print the time taken to highlight the file.
+
+### `-q/--quiet`
+
+Suppress main output.
+
+### `--paths <PATHS_FILE>`
+
+The path to a file that contains paths to source files to highlight
+
+### `--config-path <CONFIG_PATH>`
+
+The path to an alternative configuration (`config.json`) file. See [the init-config command](./init-config.md) for more information.