Added "Services" page & refactor layout structure

- Introduced a new Services component with basic setup.
- Updated layout files to ensure consistent global styling references.
- Enhanced Navbar with pathname detection for active link styling.
- Fixed navigation link URL for "Leistungen" in constants.

constant/Constant.ts

@@ -11,7 +11,7 @@ export const navLinks = [
     },
     {
         id: 3,
-        url: '#',
+        url: '/services',
         label: 'Leistungen',
     }
 ];