refactor: update UI styling and download link to point to GitHub releases

src/components/About.tsx

@@ -6,10 +6,10 @@ export function About() {
   return (
     <section
       id="about"
-      className="relative overflow-hidden bg-black py-20 sm:py-28"
+      className="relative overflow-hidden bg-gray-900 py-20 sm:py-28"
     >
       <div className="absolute top-1/2 left-20 -translate-y-1/2 sm:left-1/2 sm:-translate-x-1/2">
-        <CircleBackground color="#fff" />
+        <CircleBackground color="#fff" className="animate-spin-slower" />
       </div>
       <Container className="relative">
         <div className="mx-auto max-w-3xl sm:text-center">