Use hash history (rather than default browser history)

[gmaclennan]

Currently we don't pass opts.history to create router, which means that it creates a default BrowserHistory instance. This works in dev because we run the vite dev server, which redirects everything to /index.html, however in production we don't run a server and just read index.html from a file route. This means that reloading the page and loading a persisted route will not work. We should use hash history instead to avoid this problem.