style(header): remove logo subtitle and center instance title next to icon

frontend/index.html

@@ -12,7 +12,7 @@
     <link rel="manifest" href="/manifest.json" />
     <link rel="icon" type="image/svg+xml" href="/icon.svg" />
     <link rel="apple-touch-icon" href="/icon.svg" />
-    <title>MindSift — Der Kopf frei in drei Sekunden</title>
+    <title>MindSift</title>
     <script>
       window.__deferredPwaPrompt = null;
       window.addEventListener('beforeinstallprompt', function (e) {