relocate runbooks under clusters folder

doc/README.md

@@ -189,7 +189,7 @@ configuration. Then customize everything from buildpacks to CI/CD.
 - [Easy creation of Kubernetes clusters on GKE](user/project/clusters/index.md#adding-and-creating-a-new-gke-cluster-via-gitlab)
 - [Multiple Kubernetes Clusters](user/project/clusters/index.md#multiple-kubernetes-clusters) **[PREMIUM]**
 - [Environment-specific variables](ci/variables/README.md#limiting-environment-scopes-of-variables) **[PREMIUM]**
-- [Executable Runbooks](topics/runbooks/index.md)
+- [Executable Runbooks](user/project/clusters/runbooks/index.md)
 
 ### Monitor
 

doc/topics/runbooks/index.md → doc/user/project/clusters/runbooks/index.md

@@ -21,10 +21,9 @@ The JupyterHub app offered via GitLab’s Kubernetes integration now ships
 with Nurtch’s Rubix library, providing a simple way to create DevOps 
 runbooks. A sample runbook is provided, showcasing common operations.
 
-The below video provides an overview of how this is acomplished in GitLab.
-
-<iframe width="560" height="315" src="https://www.youtube.com/embed/Q_OqHIIUPjE" 
-frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+**<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
+Watch this [video](https://www.youtube.com/watch?v=Q_OqHIIUPjE)
+for an overview of how this is acomplished in GitLab!**
 
 ## Requirements