jotai migration (#221)

frontend/src/views/Login.tsx

@@ -16,10 +16,10 @@ import { matchW } from 'fp-ts/lib/TaskEither'
 import { pipe } from 'fp-ts/lib/function'
 import { useState } from 'react'
 import { useNavigate } from 'react-router-dom'
-import { useRecoilValue } from 'recoil'
 import { serverURL } from '../atoms/settings'
 import { useToast } from '../hooks/toast'
 import { ffetch } from '../lib/httpClient'
+import { useAtomValue } from 'jotai'
 
 const LoginContainer = styled(Container)({
   display: 'flex',
@@ -43,7 +43,7 @@ export default function Login() {
 
   const [formHasError, setFormHasError] = useState(false)
 
-  const url = useRecoilValue(serverURL)
+  const url = useAtomValue(serverURL)
 
   const navigate = useNavigate()