Canvis a "Banner for encouraging user to confirm his email address"

Is your feature request related to a problem? Please describe.
Given a decidim instance has the fast sign up config activated.

When a user, creates an account he can directly contribute to the platform without confirming its email address clicking on the link it received by email.

This leads to users not confirming their email. After 2 weeks they cannot sign in anymore and most of them do not understand they need to click on \"Didn't receive confirmation instructions?\" to confirm their email and gain access to their account.

Describe the solution you'd like
We want users to confirm their email so they can access their account easily in the long run.

For this we propose to display an alert message below the navigation bar on all pages indicating that a confirmation email was sent to the user's email address and that he has to click on the link inside it to confirm.

The banner should include a button to :

• resend the confirmation email
• edit the email address inputed in the first place in case the user made a mistake by adding a link to /account

.

Additional context

Does this issue could impact on users private data?
No

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