Removing cross-env dependency

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

package.json

@@ -269,7 +269,6 @@
     "circular-dependency-plugin": "^5.2.0",
     "color": "^3.1.2",
     "concurrently": "^5.2.0",
-    "cross-env": "^7.0.2",
     "css-element-queries": "^1.2.3",
     "css-loader": "^3.5.3",
     "dompurify": "^2.0.11",