Operator env vars documentation

currently there is hand written docs for env vars and commandline parameters, but that in itself isn't useful.

The users want to set this with Helm, or somehow in OpenShift (or maybe with stackablectl?)

These things should go into the Reference section.

We should also think about maybe generating this if we can (but not necessary, as there are probably not that many settings). Maybe we can have instead common operator flags as a partial somewhere, that we can simply reference in all the operators.

related: https://github.com/stackabletech/documentation/issues/514

まず、環境変数とコマンドラインパラメーターに関する既存の手書きドキュメントを見つけ、次に Reference セクションと関連する issue 514 を確認します。完了条件は、ユーザーが Helm または OpenShift で適用できる形式で設定が文書化され、共有 partial または生成に関する決定が結果のドキュメントに記録されていることです。