Fix heading levels (#46)
Fix heading levels (#46)

The headings used throughout the document are inconsistent. You'll probably never noticed unless you try to generate a table of contents from them, but I cleaned them up anyway.

Before:

* Lab: Build a Continuous Deployment Pipeline with Jenkins and Kubernetes
  * Introduction
  * Prerequisites
  * Do this first
  * Create a Kubernetes Cluster
  * Create namespace and quota for Jenkins
    * Create the Jenkins Home Volume
    * Create a Jenkins Deployment and Service
    * Connect to Jenkins
    * Your progress, and what's next
  * The sample app
  * Deploy the sample app to Kubernetes
    * Create a repository for the sample app source
  * Create a pipeline
    * Phase 1: Add your service account credentials
    * Phase 2: Create a job
    * Phase 3:  Modify Jenkinsfile, then build and test the app
  * Phase 4: Deploy a [canary release](http://martinfowler.com/bliki/CanaryRelease.html) to staging
* Phase 5: Deploy a development branch
    * Deploy the development branch
    * Access the development branch
  * Extra credit: deploy a breaking change, then roll back
  * Clean up

After:

* Lab: Build a Continuous Deployment Pipeline with Jenkins and Kubernetes
  * Introduction
  * Prerequisites
  * Do this first
  * Create a Kubernetes Cluster
  * Create namespace and quota for Jenkins
    * Create the Jenkins Home Volume
    * Create a Jenkins Deployment and Service
    * Connect to Jenkins
    * Your progress, and what's next
  * The sample app
    * Deploy the sample app to Kubernetes
    * Create a repository for the sample app source
  * Create a pipeline
    * Phase 1: Add your service account credentials
    * Phase 2: Create a job
    * Phase 3:  Modify Jenkinsfile, then build and test the app
    * Phase 4: Deploy a [canary release](http://martinfowler.com/bliki/CanaryRelease.html) to staging
    * Phase 5: Deploy a development branch
      * Deploy the development branch
      * Access the development branch
  * Extra credit: deploy a breaking change, then roll back
  * Clean up
iioriatti/cd-kubernates-drupal8,iioriatti/cd-kubernates-drupal8,GoogleCloudPlatform/continuous-deployment-on-kubernetes,GoogleCloudPlatform/continuous-deployment-on-kubernetes