docs(kubernetes): kubernetes helm chart install documentation

[mariomeyer]

What does this PR do?

Creates a documentation page for installing ActivePieces on a Kubernetes cluster using an existing Helm Chart.

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[abuaboud]

@mariomeyer This is awesome will take look soon!

[Startouf]

@mariomeyer I'm using your chart but I'm stuck with https://activepieces.local:80/redirect in the redirect URL when trying to set up specific OAuth connections (with Google)

Is there a specific value that I can override with my custom deployment URL ?