refactor: standardize background color to #121212

- Replaced inconsistent gray-900 and #171717 background colors with unified #121212 across all pages
- Removed unused imports from multiple component files
- Cleaned up trailing spaces in className attributes

src/pages/compute/archive/ComputeDeveloperExperience.tsx

@@ -99,7 +99,7 @@ export function ComputeDeveloperExperience() {
                   {sample.description}
                 </p>
               </div>
-              <div className="mt-auto bg-gray-900 p-6">
+              <div className="mt-auto bg-[#121212]  p-6">
                 <pre className="overflow-auto text-left text-xs leading-relaxed text-cyan-100">
                   <code>{sample.code}</code>
                 </pre>