Remove shortcuts

As per PR comment https://github.com/iv-org/invidious/pull/4145#issuecomment-1750048450

assets/site.webmanifest

@@ -17,15 +17,5 @@
     "background_color": "#575757",
     "display": "standalone",
     "description": "An alternative front-end to YouTube",
-    "start_url": "/",
-    "shortcuts": [
-        {
-            "name": "Popular",
-            "url": "/feed/popular"
-        },
-        {
-            "name": "Trending",
-            "url": "/feed/trending"
-        }
-    ]
+    "start_url": "/"
 }