■参考記事
https://relativelayout.hatenablog.com/entry/2019/05/12/083115
https://relativelayout.hatenablog.com/entry/2019/05/15/122321
■ノード詳細
https://flows.nodered.org/node/node-red-contrib-web-page-screenshot
https://flows.nodered.org/node/node-red-contrib-keikyu