Fix/email format

[BarbaraOliveira13]

🎩 Description
On the signup form, a user can create an XSS injection through the email field.

📌 Related Issues
Notion card

Testing

FRONT

1. Access the signup form.
2. Fill in the fields, and for the email field, enter

• "<script>alert('Jakick')</script>"@gmail.com or
• "<script>alert('XSS')</script>"@example.org or
• an email with ' " > or >.

4. Submit the form.
5. Verify that there is no JavaScript alert window and that the form submission is prevented.

[Stef-Rousset]

Works as expected !!