Add Raid Builder demo video to home page

src/pages/public/HomePage.tsx

@@ -3,7 +3,19 @@ export default function HomePage(){
 		<main
 			className="flex flex-col items-center justify-center gap-4"
 		>
-			<div>Home Page</div>
+			<h1
+				className="text-4xl mb-12"
+			>
+				Raid Builder Demo
+			</h1>
+			<div>
+				<iframe
+					width="640"
+					height="360"
+					src="https://www.youtube.com/embed/0WX-zoMKzSo"
+					allowFullScreen={true}
+				/>
+			</div>
 		</main>
 	);
 }