docs: add astro demo

demos/__common/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "example-config",
+  "type": "module",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {},
+  "dependencies": {
+    "og-images-generator": "link:../.."
+  }
+}

demos/__common/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "ESNext",
+    "target": "ES2022",
+
+    "lib": ["ES2022", "DOM"],
+
+    "noEmit": true,
+
+    "outDir": "types",
+
+    "strict": true,
+
+    "allowJs": true,
+    "checkJs": true,
+    "skipLibCheck": true,
+
+    "moduleResolution": "Bundler",
+
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+    "noPropertyAccessFromIndexSignature": true
+  },
+
+  "include": ["./*.js"]
+}

demos/astro/.gitignore

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+# build output
+dist/
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store

demos/astro/.prettierrc.mjs

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+/** @type {import("prettier").Config} */
+export default {
+	plugins: ["prettier-plugin-astro"],
+	overrides: [
+		{
+			files: "*.astro",
+			options: {
+				parser: "astro",
+			},
+		},
+	],
+};

demos/astro/.vscode/extensions.json

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+{
+	"recommendations": ["astro-build.astro-vscode", "unifiedjs.vscode-mdx"],
+	"unwantedRecommendations": []
+}

demos/astro/README.md

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+# og-images-generator — Astro Starter Kit: Blog
+
+## 🧞 Commands
+
+All commands are run from the root of the project, from a terminal:
+
+| Command         | Action                                      |
+| :-------------- | :------------------------------------------ |
+| `npm run dev`   | Starts local dev server at `localhost:4321` |
+| `npm run build` | Build your production site to `./dist/`     |
+
+## 👀 Want to learn more?
+
+Check out [our documentation](https://docs.astro.build) or jump into our [Discord server](https://astro.build/chat).

demos/astro/astro.config.mjs

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+import { defineConfig } from "astro/config";
+import mdx from "@astrojs/mdx";
+import sitemap from "@astrojs/sitemap";
+
+import { astroOgImagesGenerator } from "og-images-generator/astro";
+
+// https://astro.build/config
+export default defineConfig({
+	site: "http://localhost:4321",
+
+	integrations: [
+		mdx(),
+		sitemap(),
+		//
+		astroOgImagesGenerator(),
+	],
+});

demos/astro/og-images.config.js

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+// @ts-nocheck
+export * from "../__common/og-images.example-config.js";

demos/astro/package.json

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+{
+	"name": "astro",
+	"type": "module",
+	"version": "0.0.1",
+	"scripts": {
+		"dev": "astro dev",
+		"start": "astro dev",
+		"build": "astro check && astro build",
+		"preview": "astro preview",
+		"astro": "astro"
+	},
+	"dependencies": {
+		"@astrojs/check": "^0.4.1",
+		"@astrojs/mdx": "^2.1.1",
+		"@astrojs/rss": "^4.0.5",
+		"@astrojs/sitemap": "^3.0.5",
+		"astro": "^4.3.5",
+		"og-images-generator": "link:../..",
+		"typescript": "^5.3.3",
+		"vite": "^5.0.12"
+	},
+	"devDependencies": {
+		"prettier-plugin-astro": "^0.13.0"
+	}
+}