chore: change the font to montserrat

src/main.jsx

@@ -1,16 +1,15 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 
-import '@fontsource/roboto/300.css';
-import '@fontsource/roboto/400.css';
-import '@fontsource/roboto/500.css';
-import '@fontsource/roboto/700.css';
-
+import { ThemeProvider } from '@mui/material/styles';
+import theme from './theme';
 import './index.css'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
   <StrictMode>
-    <App />
+    <ThemeProvider theme={theme}>
+      <App />
+    </ThemeProvider>
   </StrictMode>,
 )