Contact creation form on "Person not found" doesn't work

[mechanarchy]

Problem
If you try to go to a contact page that no longer exists, you'll be redirected to /people/notfound. This page suggests that you add a new contact, using a form like this:

Trying to create a contact using this form doesn't work, and it also doesn't allow you to select any custom genders. I suspect this bug was introduced in #879 or a related change.

The standard form for adding new contacts (at /people/add) looks like this:

Suggested resolution

I'd suggest that the /people/notfound page should display the same form as /people/add, and the old form code is removed.

As a quicker alternative, the people/notfound page could have no form and instead a link that redirects you to /people/add.

[github-actions]

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