feat: add logo above title and full acronym to hero banner

- Place white cadCAD logo above the "cadCAD" heading
- Add "Complex Adaptive Dynamics Computer-Aided Design" subtitle

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/Hero.tsx

@@ -1,8 +1,14 @@
+import CadCADLogo from "./CadCADLogo";
+
 export default function Hero() {
   return (
     <section className="header-background relative flex min-h-screen items-center justify-center px-6 pt-20 text-center text-white">
       <div className="container mx-auto flex flex-col items-center px-3 md:w-3/5">
+        <CadCADLogo className="mb-4 h-16 md:h-20" variant="white" />
         <h1 className="my-4 text-5xl font-bold leading-tight">cadCAD</h1>
+        <p className="mb-2 text-lg italic text-white/80">
+          Complex Adaptive Dynamics Computer-Aided Design
+        </p>
         <p className="mb-8 text-xl leading-normal md:text-2xl">
           An open-source Python package that assists in the processes of
           designing, testing and validating complex systems through simulation.