Add documentation on how to use Glasskube using the GitOps approach with ArgoCD or Flux

[pmig]

Is your feature request related to a problem? Please describe.
Glasskube packages can also directly applied to the cluster using the GitOps approach. This is also often requested, but not yet documented on our website.

Describe the solution you'd like
Add a new section on how to install packages directly via the custom resource.

Additional context
We can also evaluate if glasskube/scout or renovate could be supported for package manifest upgrades.

[bhavyastar]

I would like to work on this issue. @pmig

[pmig]

Hi @bhavyastar this is an issue I actually would love to work myself as I already did some preparation for talk which a I gave at a DevOps meetup.

[bhavyastar]

We can collaborate if you would like to do.