Add plugin for rapid generation of staff pages - more design tweaks

[wesleyboar]

Overview

Changes after Design Review № 2.

Related

• TUP-548
• builds atop #253

Changes

1. do not require Phone
2. missing space between elements ^{user error caused by developer mistake (see [1])}
3. reduce margin under headings (except in content-block) ^{fixed in #253 at 71b3319}
4. add Job Title help text to clarify "Manager" text goes there
5. make UT seal image bigger

Testing

1. Save plugin instance with no phone. Confirm no error.
2. —
3. —
4. Review help text under "Job Title".
5. Save plugin instance with no image. Confirm UT seal is as wide as container.

UI

Before

https://github.com/TACC/tup-ui/assets/62723358/99f04368-bf73-4dfa-85ab-589ea59ddf0b

After

https://github.com/TACC/tup-ui/assets/62723358/f1d1aa49-e0a7-49c4-9c17-44c9525633ae