Streamline registration and login process

• Change the registration page to ask for the user's "business email"
• Make the password confirmation field mandatory
• Redirect the user to the stored url (or otherwise dashboard) after the study program page (Example: register, confirm email (without selecting programmes), invite that user to a company, click on the link in the email to accept invitation.)
  • Go to http://localhost:3000/course_editions/3 without logging in. Log in. You should be redirected back to that page.
  • Go to http://localhost:3000/course_editions/3 without filling in programmes first. Fill in programmes. You should be redirected back to that page.
  • Saving programmes should bring you to the dashboard, not the user page.