This fixes:
- #11 (closed), how to add a ticket and which fields to use
- #12 (closed), how to close a ticket
- #18 (closed), how to use JIRA, what do colors and icons mean, and what can be ignored
The onboarding course will mention this section when inviting the newcomer to take a first look at JIRA: onboarding-course!65 (merged)
How to test this MR:
- mainly check the markdown format (internal links). You can use Gitlab's preview
- check the formatting (not very consistent; I more-or-less wrote fields names as code, and references as italic)
- check that everything was addressed
- check that it's factually correct, and not too out of date
- check writing style
After merging this and onboarding-course!65 (merged), close the 3 issues mentioned above.