Link to unsupported colab notebook (IATI Networked Data Test)

From https://dataqualitytester.publishwhatyoufund.org/ there is a link to a colab notebook, developed in the 2022 index:

https://colab.research.google.com/drive/1s5Zev0IaCO9Tv1exjElVmHHFMr9jxeZ_#sandboxMode=true&scrollTo=y4RJqtbd8E7k

For various reasons this no longer works, including the fact that this notebook is no longer supported

Please remove this link

cc/ @siwhitehouse 