Merge branch 'sarah-comments' into 'develop'

Changes to slides

See merge request R3/school/courses!103
5 jobs for develop in 11 seconds (queued for 1 second)
Name Stage Failure
retrieve:repo Retrieve
Skipping Git submodules setup
Executing "step_script" stage of the job script
Using docker image sha256:c99c7d810bc1a086c72a07fa1735efce57ea0c8d67390f4a7859c734fbadb03f for alpine/git:latest with digest alpine/git@sha256:4bbc8fcbd15302e4011f8782bfa779d5a7439f4d41431c03c375cc9b5c6ab8c6 ...
$ git clone https://$CI_DEPLOY_TOKEN:$
Cloning into ''...
remote: HTTP Basic: Access denied
fatal: Authentication failed for ''
Cleaning up file based variables
ERROR: Job failed: exit code 128