Request: Environment var to disable labs

[cptfixit]

Based on a remark in this thread -> #759

"On a related note can labs as a feature be hidden?"

and

"The labs as a feature can be hidden by toggling the KUBERNETES_ENABLED flag in the angular environments.ts:"

I would very much appreciate a user-friendly way of disabling labs altogether, via an environment variable. Manually editing it in a Javascript file is a kludge. Plus, it won't work for people who use the pre-made Docker containers, when deploying via docker-compose

Plus, you're not really disabling the labs, it looks like you're just hiding a part of the user interface. That's contrary to your own secure coding lessons! ;)

So, please make an env var which we can use to fully disable all lab-related functionality in both front-end and back-end.