Need to build examples before deploying

ci/Jenkinsfile.gh-pages

@@ -58,6 +58,7 @@ def buildExample(example=STAGE_NAME) {
   def dest = "${WORKSPACE}/build/docs/examples/${example}"
   dir("examples/${example}") {
     sh 'npm install'
+    sh 'npm run build'
     sh "mkdir -p ${dest}"
     sh "cp -r build/. ${dest}"
   }