Feat: Refine UI and consolidate components

- Updated the heading in the Pastel page from 'Color Playground' to 'Pastel'.
- Adjusted the logo size in the Hero component for better visual balance.
- Removed duplicate/unused Footer components from pastel layout and ui directories.

components/Hero.tsx

@@ -24,7 +24,7 @@ export default function Hero() {
           animate={{ opacity: 1, y: 0 }}
           transition={{ duration: 0.8 }}
         >
-          <Logo size={160} />
+          <Logo size={130} />
         </motion.div>
 
         {/* Main heading */}