fix(favicon): add landing-page favicon to fix /favicon.ico 404

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/favicon.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" width="32" height="32">
+  <rect width="32" height="32" rx="7" fill="#f6821f"/>
+  <g fill="none" stroke="#ffffff" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round">
+    <path d="M7 9h18c1.1 0 2 .9 2 2v10c0 1.1-.9 2-2 2H7c-1.1 0-2-.9-2-2V11c0-1.1.9-2 2-2z"/>
+    <polyline points="27,11 16,18.5 5,11"/>
+  </g>
+</svg>

docs/index.html

@@ -5,6 +5,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>kill-the-news — Private newsletter feeds on Cloudflare Workers</title>
   <meta name="description" content="Convert email newsletters into private RSS feeds using Cloudflare Workers. Self-hosted, free tier, your own domain." />
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+  <link rel="icon" type="image/x-icon" href="/favicon.ico" sizes="32x32" />
   <link rel="preconnect" href="https://fonts.googleapis.com" />
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet" />