Sever relationships between CSON/JSON and parent languages (#4345)

* Sever relationships between CSON/JSON and parents

Fixes: #4344

References: #4291

* Fix missing CodeMirror mode for JSONLD files

lib/linguist/languages.yml

@@ -594,12 +594,10 @@ COLLADA:
   language_id: 49
 CSON:
   type: data
-  group: CoffeeScript
   tm_scope: source.coffee
   ace_mode: coffee
   codemirror_mode: coffeescript
   codemirror_mime_type: text/x-coffeescript
-  searchable: false
   extensions:
   - ".cson"
   language_id: 424
@@ -2128,7 +2126,6 @@ JFlex:
 JSON:
   type: data
   tm_scope: source.json
-  group: JavaScript
   ace_mode: json
   codemirror_mode: javascript
   codemirror_mime_type: application/json
@@ -2197,11 +2194,12 @@ JSON5:
   language_id: 175
 JSONLD:
   type: data
-  group: JavaScript
-  ace_mode: javascript
   extensions:
   - ".jsonld"
   tm_scope: source.js
+  ace_mode: javascript
+  codemirror_mode: javascript
+  codemirror_mime_type: application/json
   language_id: 176
 JSONiq:
   color: "#40d47e"