fix: update PageTitle component styling

- Changed font weight from 'font-semibold' to 'font-medium' for better visual consistency.
- Added 'not-prose' class to improve layout handling.
- Updated Link component's class to include 'text-foreground' for enhanced visibility.

app/notes/[slug]/page.tsx

@@ -143,7 +143,7 @@ const Page = async ({ params }: { params: Promise<{ slug: string }> }) => {
       </div>
 
       <h1
-        className="my-5 text-3xl font-semibold tracking-tight"
+        className="my-5 text-3xl font-medium tracking-tight"
         style={{ viewTransitionName: `note-title-${frontmatter!.slug}` }}
       >
         <Link