fix: switch default meta.image to .png

Author: AriPerkkio

packages/astro/src/default/components/MetaTags.astro

@@ -6,9 +6,13 @@ import { readPublicAsset } from '../utils/publicAsset';
 interface Props {
   meta?: MetaTagsConfig;
 }
+
+const DEFAULT_OG_IMAGE = 'https://tutorialkit.dev/tutorialkit-opengraph.png';
+
 const { meta = {} } = Astro.props;
 let imageUrl = meta.image;
 
+// Resolve relative paths to /public folder
 if (imageUrl?.startsWith('/') || imageUrl?.startsWith('.')) {
   imageUrl = readPublicAsset(imageUrl, true);
 
@@ -17,10 +21,12 @@ if (imageUrl?.startsWith('/') || imageUrl?.startsWith('.')) {
   }
 }
 
-imageUrl ??= readLogoFile('logo', true);
+imageUrl ??= readLogoFile(DEFAULT_OG_IMAGE, true);
+
 if (imageUrl?.endsWith('.svg')) {
-  console.warn(`Using a SVG open graph image "${imageUrl}". This is not supported by most social platforms. 
-  You should rather set "meta.image" to a raster image (PNG, WEBP).`);
+  console.warn(
+    `Using a SVG open graph image "${imageUrl}". This is not supported by most social platforms. You should rather set "meta.image" to a raster image (PNG, WEBP).`,
+  );
 }
 ---