should we still reference Perses in showcase notebook?

When I first ran the showcase notebook without any contextual knowledge, I was confused as to why behavior was described as "Perses-like", since the Perses homepage comes with a big "under development" disclaimer.

I now understand that OpenFE borrowed from Perses, but for a new user I think this is more distracting than it is helpful. I suggest we rephrase or remove these references for the sake of clarity.

ショーケース notebook を開き、動作を「Perses のよう」と説明している参照を見つけてください。周辺の説明を読み、新しいユーザーが Perses の開発状況に気を取られないよう、それらの参照を修正または削除してください。完了条件は、このような文脈上の混乱がなく、notebook の文言が明確になっていることです。