When users were reloading a 403 page, they were
redirected to the 404 page because of Nextjs
routing mechanism. This commit fixes this issue by
removing the 403 page from the pages directory
and creating a component that is used directly
in the layout when a 403 error is detected.
When we create a new user in the demo environment,
the email address will now follow the format
user.test@example.com instead of user@example.com.
"user" was only 4 characters long, it created failing
tests in the e2e suite.
