change apptitle from settings (#88)

frontend/src/Layout.tsx

@@ -17,6 +17,7 @@ import Toolbar from '@mui/material/Toolbar'
 import Typography from '@mui/material/Typography'
 import { grey } from '@mui/material/colors'
 import { useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet'
 import { Link, Outlet } from 'react-router-dom'
 import { useRecoilValue } from 'recoil'
 import { settingsState } from './atoms/settings'
@@ -52,6 +53,11 @@ export default function Layout() {
   return (
     <ThemeProvider theme={theme}>
       <SocketSubscriber>
+        <Helmet>
+          <title>
+            {settings.appTitle}
+          </title>
+        </Helmet>
         <Box sx={{ display: 'flex' }}>
           <CssBaseline />
           <AppBar position="absolute" open={open}>