refactor: remove text-62.5%, update site layout and add site footer

- Adjust font and typography settings across components
- Update footer with new links and start year configuration
- Modify header and navbar styling for responsive design
- Remove @unpic/astro dependency
- Refine global and component-level styling
- Update font preloading and font face definitions

src/types/index.d.ts

@@ -74,6 +74,7 @@ export interface ThemeConfig {
       name: string
       url: string
     }
+    startYear: string
   }
 
   preload: {