Common format and improvements of quickstart's README.didact.md

We should establish a common format for all quickstarts README.didact.md

OperatorHub installation

Unify OperatorHub installation steps. We introduced two different approaches to our quickstarts.

#1 Manually - camel-k-example-vdb

Now, go to your OpenShift 4.x WebConsole page, and find the OperatorHub menu item on left hand side menu and find and install "Data Virtualization Operator". This may take couple minutes to install.

#2 Didact steps - camel-k-example-event-streaming

That creates a secluded space where AMQ Streams can run. To deploy it, we subscribe to the AMQ Streams channel by using the following command:

oc apply -f infra/kafka/amq-streams-subscription.yaml

– https://github.com/openshift-integration/camel-k-example-event-streaming/blob/master/infra/kafka/amq-streams-subscription.yaml#L19
– https://github.com/openshift-integration/camel-k-example-event-streaming/blob/master/infra/messaging/broker/amq-broker-subscription.yaml#L19

Personally I would prefer #2 - we can easily specify dependency version (see ENTESB-13255)

redhat.io secret

We need a secret in order to download images from redhat.io. We should add a check for the secret to the #Requirements section and provide steps to install it to the cluster.

kamel install needs cluster-admin role

Add check to #Requirements section for cluster-admin privileges

uninstalling steps

Quickstarts are missing uninstalling steps.