refactor: clean up unused imports and component exports

- Removed unused component imports across multiple pages (AgentHeroAlt, ComputeHero, CloudPage, GpuPage, StoragePage)
- Changed ComputeDesign export from default to named export for consistency
- Removed CloudDesign section from CloudPage layout

src/pages/agents/AgentHeroAlt.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { Button } from '../../components/Button'
-import { Eyebrow, SectionHeader, P, H3 } from '../../components/Texts'
+import { Eyebrow, P, H3 } from '../../components/Texts'
 
 export function AgentHeroAlt() {
   return (