refactor(core): move app para src e padroniza estrutura

src/shared/components/page-description.tsx

@@ -0,0 +1,21 @@
+export default function PageDescription({
+	title,
+	subtitle,
+	icon,
+}: {
+	title?: string;
+	subtitle?: string;
+	icon?: React.ReactNode;
+}) {
+	return (
+		<div>
+			<h1 className="text-2xl font-semibold flex items-center gap-1 tracking-tighter">
+				<span className="text-primary">{icon}</span>
+				{title}
+			</h1>
+			<h2 className="text-sm max-w-2xl text-muted-foreground leading-relaxed mt-2">
+				{subtitle}
+			</h2>
+		</div>
+	);
+}