feat: initialize opencode project with Astro and Starlight

- Add package.json for project configuration and dependencies
- Create content configuration for Starlight documentation
- Add example guide and reference markdown files
- Create index page for documentation with navigation and next steps
- Set up TypeScript configuration for the project

web/opencode/.gitignore

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+dist
+.astro
+node_modules
+.env
+.env.production
+.DS_Store

web/opencode/README.md

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+# Starlight Starter Kit: Basics
+
+[![Built with Starlight](https://astro.badg.es/v2/built-with-starlight/tiny.svg)](https://starlight.astro.build)
+
+```
+npm create astro@latest -- --template starlight
+```
+
+> 🧑‍🚀 **Seasoned astronaut?** Delete this file. Have fun!
+
+## 🚀 Project Structure
+
+Inside of your Astro + Starlight project, you'll see the following folders and files:
+
+```
+.
+├── public/
+├── src/
+│   ├── assets/
+│   ├── content/
+│   │   └── docs/
+│   └── content.config.ts
+├── astro.config.mjs
+├── package.json
+└── tsconfig.json
+```
+
+Starlight looks for `.md` or `.mdx` files in the `src/content/docs/` directory. Each file is exposed as a route based on its file name.
+
+Images can be added to `src/assets/` and embedded in Markdown with a relative link.
+
+Static assets, like favicons, can be placed in the `public/` directory.
+
+## 🧞 Commands
+
+All commands are run from the root of the project, from a terminal:
+
+| Command                   | Action                                           |
+| :------------------------ | :----------------------------------------------- |
+| `npm install`             | Installs dependencies                            |
+| `npm run dev`             | Starts local dev server at `localhost:4321`      |
+| `npm run build`           | Build your production site to `./dist/`          |
+| `npm run preview`         | Preview your build locally, before deploying     |
+| `npm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
+| `npm run astro -- --help` | Get help using the Astro CLI                     |
+
+## 👀 Want to learn more?
+
+Check out [Starlight’s docs](https://starlight.astro.build/), read [the Astro documentation](https://docs.astro.build), or jump into the [Astro Discord server](https://astro.build/chat).

web/opencode/astro.config.mjs

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+// @ts-check
+import { defineConfig } from 'astro/config';
+import starlight from '@astrojs/starlight';
+
+// https://astro.build/config
+export default defineConfig({
+	integrations: [
+		starlight({
+			title: 'My Docs',
+			social: [{ icon: 'github', label: 'GitHub', href: 'https://github.com/withastro/starlight' }],
+			sidebar: [
+				{
+					label: 'Guides',
+					items: [
+						// Each item here is one entry in the navigation menu.
+						{ label: 'Example Guide', slug: 'guides/example' },
+					],
+				},
+				{
+					label: 'Reference',
+					autogenerate: { directory: 'reference' },
+				},
+			],
+		}),
+	],
+});

web/opencode/package.json

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+{
+  "name": "opencode",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "start": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/starlight": "^0.38.1",
+    "astro": "^6.0.1",
+    "sharp": "^0.34.2"
+  }
+}

web/opencode/src/content.config.ts

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+import { defineCollection } from 'astro:content';
+import { docsLoader } from '@astrojs/starlight/loaders';
+import { docsSchema } from '@astrojs/starlight/schema';
+
+export const collections = {
+	docs: defineCollection({ loader: docsLoader(), schema: docsSchema() }),
+};

web/opencode/src/content/docs/guides/example.md

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+---
+title: Example Guide
+description: A guide in my new Starlight docs site.
+---
+
+Guides lead a user through a specific task they want to accomplish, often with a sequence of steps.
+Writing a good guide requires thinking about what your users are trying to do.
+
+## Further reading
+
+- Read [about how-to guides](https://diataxis.fr/how-to-guides/) in the Diátaxis framework

web/opencode/src/content/docs/index.mdx

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+---
+title: Welcome to Starlight
+description: Get started building your docs site with Starlight.
+template: splash # Remove or comment out this line to display the site sidebar on this page.
+hero:
+  tagline: Congrats on setting up a new Starlight project!
+  actions:
+    - text: Example Guide
+      link: /guides/example/
+      icon: right-arrow
+    - text: Read the Starlight docs
+      link: https://starlight.astro.build
+      icon: external
+      variant: minimal
+---
+
+import { Card, CardGrid } from '@astrojs/starlight/components';
+
+## Next steps
+
+<CardGrid stagger>
+	<Card title="Update content" icon="pencil">
+		Edit `src/content/docs/index.mdx` to see this page change.
+	</Card>
+	<Card title="Change page layout" icon="document">
+		Delete `template: splash` in `src/content/docs/index.mdx` to display a
+		sidebar on this page.
+	</Card>
+	<Card title="Add new content" icon="add-document">
+		Add Markdown or MDX files to `src/content/docs` to create new pages.
+	</Card>
+	<Card title="Configure your site" icon="setting">
+		Edit your `sidebar` and other config in `astro.config.mjs`.
+	</Card>
+	<Card title="Read the docs" icon="open-book">
+		Learn more in [the Starlight Docs](https://starlight.astro.build/).
+	</Card>
+</CardGrid>

web/opencode/src/content/docs/reference/example.md

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+---
+title: Example Reference
+description: A reference page in my new Starlight docs site.
+---
+
+Reference pages are ideal for outlining how things work in terse and clear terms.
+Less concerned with telling a story or addressing a specific use case, they should give a comprehensive outline of what you're documenting.
+
+## Further reading
+
+- Read [about reference](https://diataxis.fr/reference/) in the Diátaxis framework

web/opencode/tsconfig.json

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+{
+  "extends": "astro/tsconfigs/strict",
+  "include": [".astro/types.d.ts", "**/*"],
+  "exclude": ["dist"]
+}