router now working, implemented login and logout

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/Components/Login.svelte

@@ -1,6 +1,8 @@
 <script>
+    import { onMount } from 'svelte';
     import { t } from '../translations.svelte.js';
-    import { tryLogin } from '../user.svelte.js';
+    import { checkUser, tryLogin } from '../user.svelte.js';
+
     let credentials = { username : null, password : null }
 
     function doLogin(ev){
@@ -10,6 +12,10 @@
     function init(element){
         element.focus();
     }
+
+    onMount(async () => {
+        await checkUser();
+    });
 </script>
 <style>
     label { display: block; margin: 5px; }

frontend/src/Components/Menu.svelte

@@ -1,17 +1,13 @@
 <script>
+    import { logout, user } from '../user.svelte.js';
     import { useTinyRouter } from 'svelte-tiny-router';
     import { t } from '../translations.svelte.js';
-    import { user } from '../user.svelte.js';
 
     const router = useTinyRouter();
 
     function gotoAbout(){
         router.navigate('/about');
     }
-
-    function logout(){
-        user.name = null;
-    }
 </script>
 <nav>
     <a on:click={() => router.navigate('/')}>{t('nav.Home')}</a>