chore: rewrite /login page for OAuth, write createUser for the database

client/pages/LoginPage.tsx

@@ -1,37 +1,13 @@
-import { route } from 'preact-router'
-
-import { useState } from 'preact/hooks'
 import { prependBaseUrl } from '../api.js'
 import { Header } from '../components/Header.jsx'
-import { useUserFunctions } from '../hooks/useCurrentUser.js'
 
 export const LoginPage = () => {
-    const [username, setUsername] = useState('')
-    const { login } = useUserFunctions()
-
-    const handleLogin = async () => {
-        await login(username)
-        route(prependBaseUrl('/'))
-    }
-
     return (
         <>
             <Header />
             <main class="page-login">
-                <div class="subtitle">Accedi</div>
-                <div class="form">
-                    <label for="login-username">Username</label>
-                    <input
-                        id="login-username"
-                        type="text"
-                        value={username}
-                        onInput={e => setUsername(e.target instanceof HTMLInputElement ? e.target.value : '')}
-                        onKeyDown={e => e.key === 'Enter' && handleLogin()}
-                    />
-
-                    <div class="fill">
-                        <button onClick={handleLogin}>Accedi</button>
-                    </div>
+                <div class="fill">
+                    <a class="button" role="button" href={prependBaseUrl('/auth/redirect')} data-native>Accedi con Ateneo</a>
                 </div>
             </main>
         </>