feat: add GPU overview section with key features

- Created new GpuOverview component showcasing 4 core features of GPU service
- Added responsive grid layout with feature cards displaying icons and descriptions
- Integrated overview section into GpuPage between hero and call-to-action
- Implemented dark theme styling with cyan accents for feature icons
- Added descriptive text explaining unified GPU acceleration across ThreeFold Grid

src/pages/gpu/GpuPage.tsx

@@ -1,6 +1,7 @@
 import { AnimatedSection } from '../../components/AnimatedSection'
 import { GpuHero } from './GpuHero'
 import { CallToAction } from './CallToAction'
+import { GpuOverview } from './GpuOverview'
 
 export default function GpuPage() {
   return (
@@ -8,6 +9,9 @@ export default function GpuPage() {
       <AnimatedSection>
         <GpuHero />
       </AnimatedSection>
+      <AnimatedSection>
+        <GpuOverview />
+      </AnimatedSection>
       <AnimatedSection>
         <CallToAction />
       </AnimatedSection>