organize dependencies

package.json

@@ -95,6 +95,8 @@
     "passport": "^0.4.0",
     "passport-ldapauth": "^2.0.0",
     "passport-local": "^1.0.0",
+    "react": "^16.2.0",
+    "react-dom": "^16.2.0",
     "rimraf": "^2.6.1",
     "slack-node": "^0.1.8",
     "socket.io": "^2.0.3",
@@ -155,12 +157,10 @@
     "optimize-js-plugin": "0.0.4",
     "plantuml-encoder": "^1.2.5",
     "postcss-loader": "^2.1.3",
-    "react": "^16.2.0",
     "react-bootstrap": "^0.32.1",
     "react-bootstrap-typeahead": "^3.0.3",
     "react-clipboard.js": "^1.1.3",
     "react-codemirror2": "^5.0.0",
-    "react-dom": "^16.2.0",
     "react-dropzone": "^4.2.7",
     "reveal.js": "^3.5.0",
     "sass-loader": "^7.0.1",