Users administration

Features

Authentication
- Users can enter profile details including
  - Date of birth using date picker
  - Upload profile picture
- Admin can be created by running the db:seed task from the shell and passing it appropriate environment variables: ADMIN_EMAIL=<email> ADMIN_PASSWORD=<password> rake db:seed
Authorization (users can't visit admin section and Sidekiq web UI, admin can)
Admin can
- List, view, destroy, edit and create normal users
- Send PDF with selected user's details by Email

Run the command below to generate users

docker-compose exec -e ADMIN_EMAIL=email@example.com -e ADMIN_PASSWORD=123123123 spring rails db:seed