feat(portfolio): replace skills section with about section and skills marquee

- Remove old skills data and components
- Add new about section with personal introduction and stats
- Implement animated skills marquee component
- Update navigation to reflect new section structure

src/components/GlassHeader.tsx

@@ -41,7 +41,7 @@ export default function GlassHeader({ lang }: GlassHeaderProps) {
         {/* Desktop Navigation */}
         <nav className="hidden md:flex items-center space-x-6 text-sm font-medium">
           {[ 
-            { key: 'nav.skills', icon: '🛠️ ', sectionId: 'skills' },
+            { key: 'nav.about', icon: '👨‍💻 ', sectionId: 'about' },
             { key: 'nav.projects', icon: '🚀 ', sectionId: 'projects' },
           ].map((item) => (
             <a
@@ -82,7 +82,7 @@ export default function GlassHeader({ lang }: GlassHeaderProps) {
         }`}>
           <nav className="flex flex-col space-y-3 text-sm font-medium">
             {[ 
-              { key: 'nav.skills', icon: '🛠️ ', sectionId: 'skills' },
+              { key: 'nav.about', icon: '👨‍💻 ', sectionId: 'about' },
               { key: 'nav.projects', icon: '🚀 ', sectionId: 'projects' },
             ].map((item) => (
               <a