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Set up visual regression testing with Percy

Merged Administrator requested to merge percy into master

Created by: gracewashere

See https://percy.io/

Problem:

For pull requests with UI changes, it can be difficult to tell if the changes affect elements on other pages. It can also be tedious to pull the changes down to a local machine if the contributor has forgotten to add screenshots.

Solution:

Add visual regression snapshots to our test suite with Percy. After we record the inital set of screenshots, future test suite runs will be compared against them to recognize and call out any changes.