Documentation update

[devdattakulkarni]

Now that KubePlus has deprecated support defining and enforcing Pod-level policies, we need to update our documentation to remove references of Pod-level policies. We need to update the ResourceComposition specification to remove the podconfig specification.

Here are such places where it is still remaining are the following:
https://cloud-ark.github.io/kubeplus/docs/html/html/sample-example.html
https://cloud-ark.github.io/kubeplus/docs/html/html/kubeplus-components.html

Also, update the ResourcePolicy discussion.

We should also go through all the doc pages and bring it up-to-date as required.