💄 style: create signin button and refine the navbar layouts

shared/widgets/navbar/components/SignIn.tsx

@@ -0,0 +1,15 @@
+import { Button } from "@/shared/libs/shadcn/ui/button";
+import { LogIn } from "lucide-react";
+
+const SignIn = () => {
+  return (
+    <div>
+      <Button className="cursor-pointer">
+        <LogIn />
+        Sign In
+      </Button>
+    </div>
+  );
+};
+
+export default SignIn;