check for mkdocs build

Jenkinsfile

@@ -17,10 +17,14 @@ node('local') {
             }
         }
 
-        stage('Report tests') {
+        stage('Report Tests') {
             junit '*/target/surefire-reports/*.xml'
         }
 
+        stage('Check Documentation') {
+            sh 'mkdocs build'
+        }
+
         if(currentBuild.result == null || "SUCCESS".equals(currentBuild.result)) {
             currentBuild.result = "SUCCESS"
             slackSend (color: '#00FF00', message: "${currentBuild.result}: Job '${env.JOB_NAME} #${env.BUILD_NUMBER}' (<${env.BUILD_URL}|Open>)", channel: '#biopet-bot', teamDomain: 'lumc', tokenCredentialId: 'lumc')