Add license information on all Tor training resources (community.torproject.org/training/resources)
We need to add licensing information to all training resources to specify that users can make use of, adapt, and share these resources.
Suggested license for the content: CC BY-SA 4.0
[1]
[1] https://creativecommons.org/licenses/by-sa/4.0/
cc: @gus
Edited by raya