use hash router to prevent GitHub Pages refresh

src/App.jsx

@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import "./styles/App.css"
-import { BrowserRouter as Router, Route, Routes } from "react-router-dom";
+import { HashRouter as Router, Route, Routes } from "react-router-dom";
 import Home from "./components/Home"
 import Portfolio from "./components/Portfolio"
 import Contact from "./components/Contact"