Remove duplicate corpus data entry from help

Resolves #252

The deleted part could be moved to development.

Change-Id: Ib599545bbd12addb44d12cc9618201d01caeaabf
diff --git a/templates/doc/navigation.json b/templates/doc/navigation.json
index 677d335..b301e8c 100644
--- a/templates/doc/navigation.json
+++ b/templates/doc/navigation.json
@@ -100,15 +100,9 @@
     ]
   },
   {
-    "title": "Corpus Data",
-    "id": "data",
-    "class": "folded",
-    "items": [
-      {
-        "title": "Annotations",
-        "id": "annotation"
-      }
-    ]
+    "title": "Annotations",
+    "id": "annotation",
+    "class": "folded"
   },
   {
     "title": "FAQ",
@@ -147,4 +141,4 @@
       }
     ]
   }
-]
+]
\ No newline at end of file