Build out some automated tests as part of the CI process

[ckenst]

• Use saucelabs to build out some automated tests as part of the CI process
• I'm open to using any JavaScript projects.

[ckenst]

Do #812 first. Then I can think through what this might look like.

Also we should use Playwright.

[ckenst]

Let's build some simple Playwright tests that can be run with GitHub actions. This is a small site - a handful of tests should be run.

Even using Playwright - what should be API vs UI?