[ENHANCEMENT] Migrate off of deprecated router

Context: Dependabot opened this [PR](https://github.com/GoogleChrome/webstatus.dev/pull/2017) which bumped vaadin/router to 2.0.1

But it turns out that 2.0.1 was marking the router as deprecated

We should migrate off of it. Their README has the following note:
> Consider [@lit-labs/router](https://www.npmjs.com/package/@lit-labs/router) as a more lightweight and modern alternative. Also, as the [URLPattern](https://developer.mozilla.org/en-US/docs/Web/API/URLPattern) API is universally available in modern browsers nowadays, we recommend using that for building customized client-side routing.

I'm hesitant to moving to lit-labs/router because it seems like it is in the alpha stage