Feat/og image (#15)

* feat: add dynamic Open Graph image using next/og (fixes #13)

* style: redesign OG image to feature an iPhone mockup with the Sunset theme

* test

* fix: add metadataBase to layout to resolve absolute OG image URLs

Author: tanmayhutt

package.json

@@ -37,3 +37,4 @@
     "typescript": "^5"
   }
 }
+

src/app/layout.tsx

@@ -19,6 +19,7 @@ const description =
   "Generate iPhone wallpapers from your GitHub contribution graph, with auto-updating lock screen support via iOS Shortcuts.";
 
 export const metadata: Metadata = {
+  metadataBase: new URL("https://gitwall.space"),
   title,
   description,
   keywords: [