Run a training course

As someone who is new to IBEX I'd like to learn how to use it

## Acceptance Criteria
1. A course is scheduled
1. The course content is updated as appropriate
1. The setup for the course is undertaken, enough sandbox instruments are available
1. The attendees are identified and contacted with the information of when the course will be
1. The course happens

## Notes
1. https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/Training-Instrument-Scientists-in-IBEX has information about running training courses

Start with the linked Training Instrument Scientists in IBEX wiki page to understand the existing course guidance. Done means scheduling the course, updating its content, preparing enough sandbox instruments, contacting attendees, and holding the course.

Scritto dal modello di indicizzazione a partire dal testo della issue.