Add plugin for rapid generation of staff pages - split name into first and last

[wesleyboar]

Overview & Changes

Split name into first name and last name.

^{The other fields will be added in #269. I made this its own PR, because I am altering an existing field with data, which is new to me.}

Related

• changes https://github.com/TACC/tup-ui/pull/253

Testing

0. Run local environment.
1. docker exec -it tup_cms /bin/bash
2. python manage.py migrate
3. Open CMS (be logged in).
4. Add Staff Profile plugin.
5. Verify First Name and Last Name fields exist.
6. Verify First Name and Last Name fields are required.

UI