refactor(common): update Navbar component design

Author: usmonovshohruxmirzo

src/components/common/Navbar.astro

@@ -2,7 +2,7 @@
 import { FaBars, FaGithub } from "react-icons/fa"
 ---
 
-<nav class="w-full fixed backdrop-blur-xl after:pointer-events-none after:absolute after:inset-x-0 after:bottom-0 after:h-px after:bg-white/10">
+<nav class="w-[90%] fixed top-5 left-1/2 -translate-x-1/2 backdrop-blur-xl border border-white/10 rounded-full">
   <div class="mx-auto max-w-7xl px-2 sm:px-6 lg:px-8">
     <div class="relative flex h-16 items-center justify-between">
       <div class="absolute inset-y-0 left-0 flex items-center sm:hidden">