feat: make navbar sticky for improved navigation experience

Author: IrvanFza

src/components/Navbar.astro

@@ -10,7 +10,7 @@ const navLinks = [
 ];
 ---
 
-<nav class="navbar bg-base-100 border-b border-base-300">
+<nav class="navbar bg-base-100 border-b border-base-300 sticky top-0 z-50">
   <div class="navbar-start">
     <a href="/" class="btn btn-ghost text-xl font-bold">
       MyCodingPlan