Issue #666: Add links to OpenShift documentation

The OpenShift documentation is already fairly extensive, we can link
to it when needed to expand on our own documentation.

This fixes #666

docs/source/getting-started/content/con_understanding-codeready-containers.adoc

@@ -6,6 +6,8 @@ This cluster provides a minimal environment for development and testing purposes
 It's mainly targetted at running on developers' desktops.
 For other use cases, such as headless, multi-developer/team-based setups, ..., use of the link:https://cloud.redhat.com/openshift/install/[full-fledged OpenShift installer] is recommended.
 
+You can refer to the link:https://docs.openshift.com/container-platform/latest/welcome/index.html#developer-activities[OpenShift documentation] for a more in-depth introduction to OpenShift.
+
 {prod} includes the [command]`{bin}` command-line interface (CLI) to interact with the {prod} virtual machine running the OpenShift cluster.
 
 = Differences with a production OpenShift install

docs/source/getting-started/content/proc_accessing-the-openshift-cluster.adoc

@@ -25,6 +25,8 @@ The cluster can initially be accessed through either the `kubeadmin` or `develop
 For creating projects or OpenShift applications, and for application deployment, the `developer` user should be used.
 The `kubeadmin` user should only be used for administrative tasks such as creating new users, setting roles, and so on.
 ====
++
+  . The link:https://docs.openshift.com/container-platform/latest/applications/projects/working-with-projects.html[OpenShift documentation] covers the creation of projects and applications.
 +
 See <<troubleshooting-codeready-containers_{context}>> if you cannot access the {prod} OpenShift cluster.
 
@@ -85,5 +87,7 @@ storage                              4.1.0-rc.0   True        False         Fals
 The `machine-config` and `marketplace` cluster operators are expected to report `False` availability.
 The `monitoring` cluster operator is expected to report `Unknown` availability.
 ====
++
+  . The link:https://docs.openshift.com/container-platform/latest/applications/projects/working-with-projects.html[OpenShift documentation] covers the creation of projects and applications.
 +
 See <<troubleshooting-codeready-containers_{context}>> if you cannot access the {prod} OpenShift cluster.