docs: #227 add CLI reference documentation page

src/pages/docs/reference/appendix.md

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src/pages/docs/reference/cli.md

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+---
+layout: docs
+title: CLI
+label: CLI
+order: 3
+tocHeading: 2
+---
+
+# CLI
+
+Although the most common way to interact with Greenwood is through [npm scripts in your _package.json_](/docs/introduction/setup/#commands), it is also possible to interact with the CLI programmatically in JavaScript.
+
+## Commands
+
+You can see all available commands by passing the `--help` flag to the CLI entrypoint:
+
+```shell
+$ ./node_modules/.bin/greenwood --help
+-------------------------------------------------------
+Welcome to Greenwood (v0.33.0) ♻️
+-------------------------------------------------------
+
+Usage: greenwood <command>
+
+Options:
+  -h, --help       Show help information
+  -V, --version    Show version number
+
+Commands:
+  build            Generate a production build.
+  develop          Start a local development server.
+  serve            Start a production server.
+```
+
+## Usage
+
+For programmatic usage, you can import the CLI and call the `run` function with either the **build**, **develop**, or **serve** commands.
+
+```js
+import { run } from "@greenwood/cli/src/index.js";
+
+run("build");
+```

src/pages/docs/reference/index.md

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 - [Configuration](/docs/reference/configuration/) - All of Greenwood's configuration options
 - [Plugins API](/docs/reference/plugins-api/) - Learn how to create your own plugins
+- [CLI](/docs/reference/cli/) - Interacting with the Greenwood CLI programmatically
 - [Rendering Strategies](/docs/reference/rendering-strategies/) - Techniques and tips for various rendering options like CSR, SSR, and prerendering
 - [Appendix](/docs/reference/appendix/) - Supplemental topics like Greenwood's build output, internal build state, and DOM emulation handling

src/pages/docs/reference/rendering-strategies.md

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