Third CR

• Fixes issue with sorting on leaderboard.
• Adds a lot of tests for redux action/reducers.
• Moves from state.user into redux auth_user making Redux more Single Source of Truth.
• Moves from using state.toggleAnswered from App into Home - by using useState function hook.

Second CR

Updates a lot of changes that were required from previous CR.
Adds previous-path for redirections. Updates details of poll.

First CR

0.1

Adds updating user-question asked with new dispatch.