SE-2601 Address the onboarding feedback doc
Makes a couple of changes to the handbook as part of the onboarding course feedback:
- moves the "core team member epic management" advice out of the course and into the handbook
- moves the testimonials for the time management section to the bottom of the page; they're less important than the information itself.
Testing instructions
- Read the rendered markdown for accuracy and clarity.
- Check that the links work and go to the intended location.
Reviewer
Edited by Rushal Verma