Operators: Turn examples into documentation

We have the example directories in the operators, which are very useful for us devs to quicky deploy an instance of something. But the examples are not tested.

With the getting started guide we started moving examples into the docs and testing them. It would make sense to keep doing this, with the other examples as well. There are specific examples which deploy an instance + OPA etc., which we could turn into specific docs guides.

This would be an epic and needs to be done for all operators.

まず、operator のサンプルディレクトリと Getting Started ガイドを確認します。そこでは、サンプルをテスト済みのドキュメントに移行し始めています。すべての operator に残っているサンプルを洗い出し、どれを個別のガイドにすべきかを特定し、選択した各サンプルがドキュメント化され、テスト済みであることを完了の定義とします。