feat: enhance styling and layout with new global styles, scrollbar customization, and updated content

- Added Google Sans Code font to globals.css for improved typography.
- Introduced new CSS variables for theming in globals.css, enhancing dark mode support.
- Updated layout.tsx to include custom scrollbar styles from scrollbar.css.
- Modified page.tsx to improve the "About" section with more engaging content.
- Refactored NeoFetch component for better styling and layout consistency.
- Commented out scroll behavior in Top component for smoother navigation.
- Added new art.html file for visual representation in the NeoFetch component.

src/app/layout.tsx

@@ -1,5 +1,6 @@
 import type { Metadata } from "next";
 import "./globals.css";
+import "./scrollbar.css";
 
 export const metadata: Metadata = {
   title: "남현석 | :two_hearts: imnya.ng",