DataSHIELD training tutorial October 2023

A huge thanks to everyone who pulled together the DataSHIELD training workshop as part of this years conference. I wanted to post a link to the training materials, in case people wanted to use/run them. Though we will need a little bit of page management on the wiki - maybe we can move the tutorial to the education section of the wiki and link to it from the comms/2023 conference page. For now here is the link to the updated tutorial.