feat: add PWA support

src/pages/manifest.json.js

@@ -0,0 +1,34 @@
+import { getImage } from 'astro:assets'
+import favicon from '../assets/favicon.png'
+import { siteConfig } from "../config.js";
+// thanks to https://kremalicious.com/favicon-generation-with-astro
+const faviconPngSizes = [192, 512]
+
+export const GET = async () => {
+    const icons = await Promise.all(
+        faviconPngSizes.map(async (size) => {
+            const image = await getImage({
+                src: favicon,
+                width: size,
+                height: size,
+                format: 'png'
+            })
+            return {
+                src: image.src,
+                type: `image/${image.options.format}`,
+                sizes: `${image.options.width}x${image.options.height}`
+            }
+        })
+    )
+
+    const manifest = {
+        name: siteConfig.title,
+        description: siteConfig.description,
+        start_url: '/',
+        display: 'standalone',
+        id: 'deadbeef-d7d8-4d48-8a7a-593be33d9f77',
+        icons
+    }
+
+    return new Response(JSON.stringify(manifest))
+}