Rename the "Handbook Group" page to "Handbook Team".
This includes a few Handbook Team changes:
- It renames the "Handbook Group" page to "Handbook Team".
- It changes the Handbook Team page path from
/handbook/engineering/development/growth/handbook/
to/handbook/engineering/development/growth/handbook-team/
for clarity. - It updates a couple links and corresponding text.
- It removes a couple stray commas.