Volunteer form design issues

[smrose]

The form that volunteers use to create and edit their profiles is at /ps/volunteer/profile.php. That has a design that is drawn from one created by Roma on Figma. There are some issues with that design:

1. It looks nothing like any other page in the Pattern Sphere.
2. There is a navigation bar at the top that has the elements she specified but for which some lack a URL.

Let's fix this design by some combination of moving to something that looks like other pages and has no broken links in the navigation bar.