Build redesigned permission screens

Builds designs decided in #441 (closed) Figma link

For animations, refer to Ethan's comments

For the Overlay, first try building a new component using <dialog'> then go back and refactor our USWDS Modal component based on whether that meets our needs.

Acceptance Criteria (tk)

• Overlay should scroll / scrolling outside overlay is prevented
• Overlay should have same a11y requirements as modal (trap focus, escape to close, clicking outside overlay should close, etc)
• Stretch goal: link to particular user in overlay is sharable (i.e. has proper ids in url)