initial: Astro port of ViralMVP with favicon + SEO redirects

public/_redirects

@@ -0,0 +1 @@
+/sitemap.xml /sitemap-index.xml 301

public/favicon.svg

@@ -0,0 +1,14 @@
+<svg viewBox="0 0 128 128" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="ViralMVP">
+  <defs>
+    <linearGradient id="bg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#FF5A4A"/>
+      <stop offset="50%" stop-color="#E83A2E"/>
+      <stop offset="100%" stop-color="#A11B1B"/>
+    </linearGradient>
+  </defs>
+  <rect width="128" height="128" rx="24" fill="url(#bg)"/>
+  <text x="64" y="92" text-anchor="middle"
+        font-family="Georgia, 'Times New Roman', serif"
+        font-weight="700" font-style="italic"
+        font-size="96" fill="#FFFFFF">V</text>
+</svg>