Adds an integration starter example (#4877)

* adding an integration starter example

* chore: linter fixes

* removing components from the integration example

* removing the monorepo and demo project, adding links to docs and examples

* chore: update lock file

* typo fix

examples/integration/README.md

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+# Astro Starter Kit: Integration Package
+
+This is a template for an Astro integration. Use this template for writing integrations to use in multiple projects or publish to NPM.
+
+```
+npm create astro@latest -- --template integration
+```
+
+[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/withastro/astro/tree/latest/examples/integration)
+
+
+## 🚀 Project Structure
+
+Inside of your Astro project, you'll see the following folders and files:
+
+```
+/
+├── index.ts
+├── tsconfig.json
+├── package.json
+```
+
+The `index.ts` file is the "entry point" for your integration. Export your integration in `index.ts` to make them importable from your package.
+
+## 🧞 Commands
+All commands are run from the root of the project, from a terminal:
+
+| Command                | Action                                           |
+| :--------------------- | :----------------------------------------------- |
+| `npm link`              | Registers this package locally. Run `npm link my-integration` in an Astro project to install your integration
+| `npm publish` | [Publishes](https://docs.npmjs.com/creating-and-publishing-unscoped-public-packages#publishing-unscoped-public-packages) this package to NPM. Requires you to be [logged in](https://docs.npmjs.com/cli/v8/commands/npm-adduser)

examples/integration/index.ts

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+import type { AstroIntegration } from 'astro';
+
+export default function createIntegration(): AstroIntegration {
+	// See the Integration API docs for full details
+	// https://docs.astro.build/en/reference/integrations-reference/
+	return {
+		name: '@example/my-integration',
+		hooks: {
+			'astro:config:setup': () => {
+				// See the @astrojs/react integration for an example
+				// https://github.com/withastro/astro/blob/main/packages/integrations/react/src/index.ts
+			},
+			'astro:build:start': ({ buildConfig }) => {
+				// See the @astrojs/netlify integration for an example
+				// https://github.com/withastro/astro/blob/main/packages/integrations/netlify/src/integration-functions.ts
+			},
+			'astro:build:done': ({ dir, routes }) => {
+				// See the @astrojs/partytown integration for an example
+				// https://github.com/withastro/astro/blob/main/packages/integrations/partytown/src/index.ts
+			},
+		},
+	};
+}

examples/integration/package.json

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+{
+  "name": "@example/integration",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "exports": {
+    ".": "./index.ts"
+  },
+  "files": [
+    "src",
+    "index.ts"
+  ],
+  "keywords": [
+    "withastro"
+  ],
+  "scripts": {},
+  "devDependencies": {
+    "astro": "^1.4.2"
+  },
+  "peerDependencies": {
+    "astro": "^1.4.2"
+  }
+}

examples/integration/tsconfig.json

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+{
+  "extends": "astro/tsconfigs/base"
+}