Browser automation testing

[markulrich]

We have lots of free credits with https://www.lambdatest.com/ can we make it so that https://every-month.vercel.app/ can accept query params to control which version pops up? And maybe host it at https://assets.every.org/ same as the bundle? Then we can periodically load both versions on a bunch of different browsers and make sure it looks good.

[osdiab]

More general title; doesn't need to be lambdatest, we can also do this with github actions and playwright, which is free since this is a public repo.