fix(*): storybook should be in devDependencies, not dependencies

package.json

@@ -65,7 +65,6 @@
     "@apollo/client": "3.2.2",
     "@apollo/react-testing": "3.1.4",
     "@babel/core": "7.11.6",
-    "@coko/storybook": "^1.2.2",
     "@guardian/prosemirror-invisibles": "1.2.1",
     "@pubsweet/base-model": "4.0.0",
     "@pubsweet/component-send-email": "0.4.3",
@@ -165,6 +164,7 @@
     "@babel/preset-env": "7.11.5",
     "@babel/preset-react": "7.10.4",
     "@coko/lint": "^1.4.0",
+    "@coko/storybook": "^1.2.2",
     "babel-core": "7.0.0-bridge.0",
     "babel-jest": "23.6.0",
     "babel-loader": "8.1.0",