Create support bootcamp onboarding checklist

Overview

Create a support bootcamp list for service engineer onboarding.

Resources

The sales team performs onboarding as a bootcamp list. See below.

• Example: https://dev.gitlab.org/gitlab/organization/issues/905
• Handbook: https://about.gitlab.com/handbook/sales-onboarding/

Implementation

• Update https://university.gitlab.com/support/ to ensure all content is relevant (remove outdated content)
• Create a new bootcamp list from the above GUI - markdown formatting
• Add the bootcamp checklist to the support handbook onboarding section - https://about.gitlab.com/handbook/support/onboarding/

//cc @ernstvn