Revert "MuseScore survey"

This reverts commit 741a42d.

Author: thomasbonte

src/config/content.json

@@ -1,15 +1,4 @@
 [
-  {
-    "id": "musescore-survey",
-    "title": "Take the MuseScore survey",
-    "image": "https://farm6.staticflickr.com/5528/11911636584_ce0f156185_z.jpg",
-    "url": {
-      "value": "https://goo.gl/forms/CHbXSlVGKJasj72k2",
-      "localise": false
-    },
-    "description": "You can win MuseScore Pro",
-    "ttl": 630720000
-  },
   {
     "id": "getting-started",
     "title": "Getting Started",