use svg favicon

examples/blog/public/astro.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 36 36">
+  <path fill="#000" d="M22.25 4h-8.5a1 1 0 0 0-.96.73l-5.54 19.4a.5.5 0 0 0 .62.62l5.05-1.44a2 2 0 0 0 1.38-1.4l3.22-11.66a.5.5 0 0 1 .96 0l3.22 11.67a2 2 0 0 0 1.38 1.39l5.05 1.44a.5.5 0 0 0 .62-.62l-5.54-19.4a1 1 0 0 0-.96-.73Z"/>
+  <path fill="url(#gradient)" d="M18 28a7.63 7.63 0 0 1-5-2c-1.4 2.1-.35 4.35.6 5.55.14.17.41.07.47-.15.44-1.8 2.93-1.22 2.93.6 0 2.28.87 3.4 1.72 3.81.34.16.59-.2.49-.56-.31-1.05-.29-2.46 1.29-3.25 3-1.5 3.17-4.83 2.5-6-.67.67-2.6 2-5 2Z"/>
+  <defs>
+    <linearGradient id="gradient" x1="16" x2="16" y1="32" y2="24" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#000"/>
+      <stop offset="1" stop-color="#000" stop-opacity="0"/>
+    </linearGradient>
+  </defs>
+	<style>
+    @media (prefers-color-scheme:dark){:root{filter:invert(100%)}}
+  </style>
+</svg>

examples/blog/src/components/BaseHead.astro

@@ -9,13 +9,13 @@ export interface Props {
 	image?: string;
 }
 
-const { title, description, image = '/placeholder-social.png' } = Astro.props;
+const { title, description, image = '/placeholder-social.jpg' } = Astro.props;
 ---
 
 <!-- Global Metadata -->
 <meta charset="utf-8" />
 <meta name="viewport" content="width=device-width,initial-scale=1" />
-<link rel="icon" type="image/x-icon" href="/favicon.ico" />
+<link rel="icon" type="image/svg+xml" href="/astro.svg" />
 <meta name="generator" content={Astro.generator} />
 
 <!-- Primary Meta Tags -->