Document talks I've given in the past

This can include proprietary talks, with the caveat that there is no more information provided than is there on the description, and that there are no slides available.

added talks label

added To Do label

added Doing and removed To Do labels

mentioned in merge request !82 (merged)

assigned to @jamietanna

closed via merge request !82 (merged)

Need to add intro-to-bash talk from work.

reopened