feat: add cloud services dropdown menu in header

- Replaced individual cloud service pages with CallToAction components for Compute, Storage and GPU
- Added dropdown menu in header to consolidate cloud service navigation options
- Removed redundant page components (Compute.tsx, Storage.tsx, Gpu.tsx) that shared identical layouts
- Updated route components to use new CallToAction components
- Added ChevronDownIcon to visually indicate dropdown functionality

src/components/Header.tsx

@@ -1,4 +1,6 @@
 import { Link } from 'react-router-dom'
+import { Dropdown } from './ui/Dropdown'
+import { ChevronDownIcon } from '@heroicons/react/20/solid'
 import { Container } from './Container'
 import { Button } from './Button'
 import pmyceliumLogo from '../images/logos/pmyceliumlogo.png'
@@ -13,12 +15,20 @@ export function Header() {
               <img src={pmyceliumLogo} alt="Mycelium" className="h-8 w-auto" />
             </Link>
             <div className="hidden lg:flex lg:gap-10">
-              <Link
-                to="/cloud"
-                className="text-base/7 tracking-tight text-gray-700 hover:text-cyan-500 transition-colors"
-              >
-                Cloud
-              </Link>
+              <Dropdown
+                buttonContent={
+                  <>
+                    Cloud
+                    <ChevronDownIcon className="h-5 w-5" aria-hidden="true" />
+                  </>
+                }
+                items={[
+                  { name: 'Cloud', href: '/cloud' },
+                  { name: 'Compute', href: '/compute' },
+                  { name: 'Storage', href: '/storage' },
+                  { name: 'GPU', href: '/gpu' },
+                ]}
+              />
               <Link
                 to="/network"
                 className="text-base/7 tracking-tight text-gray-700 hover:text-cyan-500 transition-colors"