Developer experience updates

[tomalrussell]

In terms of dev-experience and bringing the app a little closer to the more recent global work, you might like to review and port some PRs, @eatyourgreens (or reject/counter-suggest, I'm open to views on what's worth doing or could be improved):

• switch build to "vite" Migrate from CRA to Vite infra-risk-vis#141 see also Update development proxy handling irv-frontend#23
• other major dependencies Update dependencies, minor fixes irv-frontend#18
• linting and reformatting Reformat with Prettier infra-risk-vis#139 and Automatically lint and format irv-frontend#33

[eatyourgreens]

I was going to open an issue about migrating from CRA, since it isn't maintained. I'll take a look at that Vite PR.

[eatyourgreens]

The app is building with Vite now (CI builds are much faster too!)

I've upgraded ESLint but haven't turned on automatic linting yet. There are still a lot of linter errors, mostly typescript complaining about don't use {} as a type or unexpected any.