move examples to dedicated folder, update create app and ci accordingly

ci/Jenkinsfile

@@ -69,7 +69,7 @@ pipeline {
 
 def buildExample(example=STAGE_NAME) {
   def dest = "${WORKSPACE}/build/docs/${example}"
-  dir("${example}") {
+  dir("examples/${example}") {
     sh 'pnpm install --silent'
     sh 'pnpm run build'
     sh "mkdir -p ${dest}"
@@ -79,6 +79,7 @@ def buildExample(example=STAGE_NAME) {
 
 def copyExample(example=STAGE_NAME) {
   sh "mkdir -p build/docs/${example}"
-  sh "cp ${example}/index.html build/docs/${example}/"
-  sh "[ -f ${example}/style.css ] && cp ${example}/style.css build/docs/${example}/ || exit 0"
+  sh "cp examples/${example}/*.html build/docs/${example}/"
+  sh "cp examples/${example}/*.js build/docs/${example}/"
+  sh "cp examples/${example}/*.css build/docs/${example}/"
 }