feat: update HTML structure and add logo for Weather App; remove unused SVG from WeatherCard

frontend/src/components/Header.tsx

@@ -2,6 +2,7 @@ import React from "react";
 import ChangeAPI from "./ChangeAPI";
 import { useState } from "react";
 import Cookies from "js-cookie";
+import logo from "../assets/cloud-sun-fill.svg";
 
 const Header: React.FC = () => {
   const [apiCard, setApiCard] = useState(false);
@@ -12,7 +13,7 @@ const Header: React.FC = () => {
       <header className="bg-gradient-to-r from-blue-700 via-blue-600 to-blue-500 text-white shadow-lg py-8 px-6 flex items-center justify-between rounded-b-3xl">
         <div className="flex items-center gap-4">
           <img
-            src="/favicon.ico"
+            src={logo}
             alt="Weather App Logo"
             className="w-10 h-10 drop-shadow-lg"
           />