refactor: simplify product section content and layout

- Condensed GPU Architecture section from detailed bullet points to concise three-pillar overview
- Removed redundant descriptive paragraphs from Capabilities and Design sections
- Streamlined Network Hero messaging and added standalone/integrated positioning
- Created new NetworkCapabilities component with four-column grid layout

src/pages/gpu/GpuCapabilities.tsx

@@ -37,10 +37,6 @@ export function GpuCapabilities() {
         <div className="mx-auto max-w-3xl text-center">
           <Eyebrow>CAPABILITIES</Eyebrow>
           <H3 className="mt-4 text-gray-900">What You Can Run on Mycelium Cloud</H3>
-          <P className="mt-6 text-gray-600">
-            GPU workloads can run anywhere on the mesh — on cloud capacity, your own machines,
-            or edge nodes — with full sovereignty.
-          </P>
         </div>
 
         <div className="mx-auto mt-16 max-w-5xl">