feat: make navbar sticky

Author: milan-codes

src/components/Navbar.astro

@@ -2,7 +2,10 @@
 import ArrowUpRight from "./ArrowUpRight.astro";
 ---
 
-<nav aria-label="Navigation bar" class="py-4">
+<nav
+  aria-label="Navigation bar"
+  class="sticky top-0 z-10 bg-gray-50 py-4 dark:bg-[#0a0a0a]"
+>
   <ul class="flex gap-4 font-medium lowercase text-gray-900 dark:text-gray-100">
     <li>
       <a class="py-2 hover:underline" href="/"> Home </a>