Remove binary icon asset and align icon config/docs (#18)

static/icons/icon.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512" role="img" aria-label="Generic app icon">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#0ea5e9"/>
+      <stop offset="100%" stop-color="#2563eb"/>
+    </linearGradient>
+  </defs>
+  <rect x="32" y="32" width="448" height="448" rx="96" fill="url(#bg)"/>
+  <circle cx="256" cy="214" r="78" fill="#ffffff" fill-opacity="0.92"/>
+  <rect x="156" y="316" width="200" height="36" rx="18" fill="#ffffff" fill-opacity="0.92"/>
+</svg>