Update 'Jenkinsfile'

Jenkinsfile

@@ -2,22 +2,14 @@ node {
     def app
 
     stage('Clone repository') {
-        /* Let's make sure we have the repository cloned to our workspace */
-
         checkout scm
     }
 
     stage('Build image') {
-        /* This builds the actual image; synonymous to
-         * docker build on the command line */
-
         app = docker.build("getintodevops/hellonode")
     }
 
     stage('Test image') {
-        /* Ideally, we would run a test framework against our image.
-         * For this example, we're using a Volkswagen-type approach ;-) */
-
         app.inside {
             sh 'echo "Tests passed"'
         }