Tests: Moved MathType, Wproofreader and Article manual tests to the m…

…ain CKEditor5 repository. See [ckeditor/ckeditor5#2054](ckeditor/ckeditor5#2054).

package.json

@@ -26,29 +26,19 @@
     "lodash-es": "^4.17.10"
   },
   "devDependencies": {
-    "@ckeditor/ckeditor5-alignment": "^11.2.0",
     "@ckeditor/ckeditor5-autoformat": "^11.0.5",
     "@ckeditor/ckeditor5-basic-styles": "^11.1.4",
     "@ckeditor/ckeditor5-block-quote": "^11.1.3",
-    "@ckeditor/ckeditor5-cloud-services": "^11.0.5",
-    "@ckeditor/ckeditor5-easy-image": "^11.0.5",
     "@ckeditor/ckeditor5-editor-classic": "^12.1.4",
     "@ckeditor/ckeditor5-essentials": "^11.0.5",
-    "@ckeditor/ckeditor5-font": "^11.2.2",
     "@ckeditor/ckeditor5-heading": "^11.0.5",
-    "@ckeditor/ckeditor5-highlight": "^11.0.5",
     "@ckeditor/ckeditor5-image": "^14.0.0",
-    "@ckeditor/ckeditor5-indent": "^10.1.0",
     "@ckeditor/ckeditor5-link": "^11.1.2",
     "@ckeditor/ckeditor5-list": "^12.1.0",
     "@ckeditor/ckeditor5-media-embed": "^11.1.4",
-    "@ckeditor/ckeditor5-mention": "^13.0.0",
     "@ckeditor/ckeditor5-paragraph": "^11.0.5",
-    "@ckeditor/ckeditor5-paste-from-office": "^11.1.0",
-    "@ckeditor/ckeditor5-remove-format": "^10.0.4",
     "@ckeditor/ckeditor5-table": "^14.0.0",
     "@ckeditor/ckeditor5-ui": "^14.0.0",
-    "@wiris/mathtype-ckeditor5": "^7.16.1",
     "eslint": "^5.5.0",
     "eslint-config-ckeditor5": "^2.0.0",
     "husky": "^1.3.1",