Please link to the new repo

[ahmetb]

It seems like this repo is not being developed anymore.

But it's the top search result for knctl.

Maybe consider:

1. archiving this repo
2. linking to https://github.com/knative/client prominently.

[rugwirobaker]

Does kn have the same functionalities as knctl? For example does it have knctl install and knctl uninstall