The Contributing Guidelines links should not point to the doc site repo

[chriscorcimiglia]

The Contributing Guidelines look pretty solid, but the links go to https://github.com/cablelabs/adrenaline-docs The links should really go to https://github.com/cablelabs/snaps-kubernetes since that's where the code resides.

If you want contributions to the doc site itself, then that could be indicated in the How Can I Contribute? section.

So, in general, we're trying to communicate how contribute to the Adrenaline Project, which is first the snaps-k8s codebase (the adrenaline subdirectory specifically) and then to the documentation of the project (this doc site), so the links should communicate that as well.