Move crds to `config/crd/`

[lucacome]

As a maintainer and user of NGF
I want all generated CRDs to be placed in the standard 'config/crd' path as the source of truth
So that I can easily find the definitions for all CRDs in the project.

Acceptance

• Generated CRDs are located in the standard path config/crd and use it as the source of truth.
• Helm charts are still able to utilize the generated CRDs from Helm's CRD directory using a symbolic link.
• NGF Manifests are still installable using the same method identified in our documentation.

[sjberman]

I'm assuming this is for manifests? And where does this standard come from? The helm chart is currently the source of truth, since it generates the manifests.