Links to open in Google Colab are no longer working

[USDSOM]

I see the following error:

Notebook not found There was an error loading this notebook. Ensure that the file is accessible and try again. https://github.com/jakevdp/PythonDataScienceHandbook/blob/master/notebooks/Index.ipynb

Could not find Index.ipynb in https://api.github.com/repos/jakevdp/PythonDataScienceHandbook/contents/notebooks?per_page=100&ref=master tb@https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:89:522 PI@https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:2174:73 @https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:2161:448 xa@https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:21:65 @https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:19:197 @https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:22:53 b@https://ssl.gstatic.com/colaboratory-static/common/5d71429ee6657823934f508bf7362902/external_polymer_binary.js:22:313