make `./docs/crds` depend and consume `make generate-crds` and `./generated-crds`

[viccuad]

Current Behavior

Right now we obtain the fully generated CRDs by doing make generate-crds, and they end in ./generated-crds.

But this is not being used by the make target under ./docs/crds`.

Expected Behavior

Change make target of ./docs/crds to consume the result of make generate-crds.

Then, we can consume that in docs.kubewarden.io under "references", and also at https://doc.crds.dev/github.com/kubewarden/kubewarden-controller.