When inviting a user with an email link, the email should automatically be filled in when clicking in the link

[Paul-Eraman-CoopCycle]

Describe the bug
When I invite a user with the email with the "invite a user" button from the user management page, this sends them an email link to make an account. Currently with the new account creation page, all the information is blank.
Given that I may have already associated this email invitation with a particular restaurant or shop, and given that many business owners have multiple email addresses and get confused, we should have the link automatically fill in that email in the account creation page.

To Reproduce
Steps to reproduce the behavior:

1. Invite a user
2. Click on the invitation link in the email that is send
3. See that the linked page has no filled out information

Expected behavior
The email address should be filled in and not editable. We have invited a particular person with a particular email for a reason

Screenshots

web