Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/cicd/solutions/deploy_to_kubernetes/Jenkinsfile

@@ -0,0 +1,45 @@
+pipeline {
+
+  agent any
+
+  stages {
+
+    stage('Checkout Source') {
+      steps {
+        git url:'https://github.com/<GITHUB_USERNAME>/<YOUR_WEB_APP_REPO>.git',
+        // credentialsId: 'creds_github',
+        branch:'master'
+      }
+    }
+    
+      stage("Build image") {
+            steps {
+                script {
+                    myapp = docker.build("<YOUR_DOCKER_USERNAME>/helloworld:${env.BUILD_ID}")
+                }
+            }
+        }
+    
+      stage("Push image") {
+            steps {
+                script {
+                    docker.withRegistry('https://registry.hub.docker.com', 'dockerhub') {
+                            myapp.push("latest")
+                            myapp.push("${env.BUILD_ID}")
+                    }
+                }
+            }
+        }
+
+    
+    stage('Deploy App') {
+      steps {
+        script {
+          sh 'ansible-playbook deploy.yml'
+        }
+      }
+    }
+
+  }
+
+}