Upgrade to Webpack 5 (or Vite, or something else for local playgrounds)

[coolsoftwaretyler]

In #115 and #116, we upgraded Node and chromedriver, which breaks older versions of Webpack.

We have monkey patched the hashing function, but it would be preferable to update the Webpack config to a modern version.

I'm also open to Vite, which I personally have used for browser extensions before and like a lot. Open to other suggestions or PRs!