Improve onboarding: One-page password creation

[ok200paul]

This one was raised by Inca - we need to simplify the user onboarding process as it's a bit clunky

Current Process

• Admin visits admin panel > selects team > adds user to team > clicks "Send Invite"

• User recieves email prompting to reset password > They click the link > they then need to input their email and follow the "forgot my password" process

This is a little confusing and has too many steps.

Proposed Process

• User recieves email prompting to reset password > They click the link
• They get brought to a simple "Set your password" page, something like the below
• They set their password, and get brought to the home dashboard.