Removes borders around form sections

[daniellemaxwell]

Scope of changes

This removes borders that appeared around smaller sections of the registration form. The borders were removed from the Legal Form, Contacts Form, and TRISA Implementation Form.

Below is an image of the Legal Form which displays the borders that have been removed in this PR: https://www.awesomescreenshot.com/image/45230137?key=90d86e2a4ffbb0639a2196b56934f4b3

Note: Padding above the buttons will addressed in another story.

Type of change

• [ ] bug fix
• [ ] new feature
• [ ] documentation
• [ ] other (describe)

Acceptance criteria

Note: Some changes were made to allow me to make changes while not being able to log in. This caused the form to take longer to load in the video below, so no stories will be created to address the issues that appear when in the video.

https://www.awesomescreenshot.com/video/23806300?key=464e6853ac043ab69eb732284a0f981f

Author checklist

• [x] I have manually tested the change and/or added automation in the form of unit tests or integration tests
• [ ] I have updated the dependencies list
• [ ] I have recompiled and included new protocol buffers to reflect changes I made
• [ ] I have added new test fixtures as needed to support added tests
• [x] Check this box if a reviewer can merge this pull request after approval (leave it unchecked if you want to do it yourself)
• [x] I have moved the associated Shortcut story to "Ready for Review"

Reviewer(s) checklist

• [ ] Any new user-facing content that has been added for this PR has been QA'ed to ensure correct grammar, spelling, and understandability.