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.

app/(app)/pastel/page.tsx

@@ -61,7 +61,7 @@ function PlaygroundContent() {
     <div className="min-h-screen py-12">
       <div className="max-w-7xl mx-auto px-8 space-y-8">
         <div>
-          <h1 className="text-4xl font-bold mb-2">Color Playground</h1>
+          <h1 className="text-4xl font-bold mb-2">Pastel</h1>
           <p className="text-muted-foreground">
             Interactive color manipulation and analysis tool
           </p>