Add 'serve' script to node scripts and use it in jenkinsfile

Jenkinsfile

@@ -146,14 +146,15 @@ node('lisk-nano') {
 
             # Run end-to-end tests
 
+            npm run serve --  $WORKSPACE/app/build -p 300$N -a 127.0.0.1 &>server.log &
             if [ -z $CHANGE_BRANCH ]; then
-              npm run --silent e2e-test -- --params.baseURL file://$WORKSPACE/app/build/index.html --params.liskCoreURL https://testnet.lisk.io --cucumberOpts.tags @testnet --params.useTestnetPassphrase true
+              npm run --silent e2e-test -- --params.baseURL http://127.0.0.1:300$N  --params.liskCoreURL https://testnet.lisk.io --cucumberOpts.tags @testnet --params.useTestnetPassphrase true
             else
               echo "Skipping @testnet end-to-end tests because we're not on 'development' branch"
             fi
-            npm run --silent e2e-test -- --params.baseURL file://$WORKSPACE/app/build/index.html --params.liskCoreURL http://127.0.0.1:400$N
+            npm run --silent e2e-test -- --params.baseURL http://127.0.0.1:300$N  --params.liskCoreURL http://127.0.0.1:400$N
             if [ -z $CHANGE_BRANCH ]; then
-              npm run --silent e2e-test -- --params.baseURL file://$WORKSPACE/app/build/index.html --cucumberOpts.tags @testnet --params.useTestnetPassphrase true --params.network testnet
+              npm run --silent e2e-test -- --params.baseURL http://127.0.0.1:300$N  --cucumberOpts.tags @testnet --params.useTestnetPassphrase true --params.network testnet
             else
               echo "Skipping @testnet end-to-end tests because we're not on 'development' branch"
             fi

package.json

@@ -25,7 +25,8 @@
     "pack": "npm install && npm run build && npm run clean-dist && npm run dist",
     "pack:win": "cmd /c npm install && npm run clean-build && npm run copy-files && npm run build-prod && npm run build-electron && npm run clean-dist && npm run dist:win",
     "storybook": "start-storybook -p 6006 -s ./src/",
-    "build-storybook": "build-storybook"
+    "build-storybook": "build-storybook",
+    "serve": "http-server"
   },
   "author": "Lisk Foundation <admin@lisk.io>, lightcurve GmbH <admin@lightcurve.io>",
   "license": "GPL-3.0",
@@ -125,7 +126,7 @@
     "postcss-loader": "=2.0.6",
     "postcss-partial-import": "=4.1.0",
     "postcss-reporter": "5.0.0",
-    "protractor": "5.1.2",
+    "protractor": "5.3.1",
     "protractor-cucumber-framework": "3.1.0",
     "raw-loader": "1.0.0-beta.0",
     "react-addons-test-utils": "=15.6.0",
@@ -143,7 +144,8 @@
     "url-loader": "0.5.9",
     "webpack": "3.6.0",
     "webpack-bundle-analyzer": "2.9.0",
-    "webpack-dev-server": "2.8.2"
+    "webpack-dev-server": "2.8.2",
+    "serve": "http-server"
   },
   "build": {
     "appId": "io.lisk.nano",