update apps link

[lheagy]

courtesy of @prisae!

prisae 11:49 PM
The link given under "resources"=>"apps" on https://disc2017.geosci.xyz seems to be dead (https://notebooks.azure.com/lheagy/projects/em_apps). Are those notebooks stored somewhere else?

[prisae]

Throwing in some keywords, in case someone looks for it in the issues:

• DISC2017
• EM-Apps
• Azure