The current example showing how to decode a secret
does it in several steps which is fine but if some level
of security is required will leak the encoded secret
value in the shell history thus making it retrievable.
This patch adds an example on how to retrieve that
value without exposing it.
There are many contents in the (*very big*) Secret concept page which
are actually tasks. This PR proposes a separation of some contents
into separate tasks, so that we have a (hopefully) better organization
of the content and we make room for improvement to the concept itself.
Note that the creation of the `configmap-secret` directory (instead of
`secret`) is an intent to create a folder for both ConfigMap and Secret,
both of which are about configurations though there are quite some
differences between them.