Upgrade to latest version / distribution of `Lit@2`

Problem to solve

lit-html and LitElement have / are getting a new release all under a new top level package namespace called lit.

Although lit is technically still in RC, it would be helpful to ensure that the API of both LitElement and lit-html are indeed backwards compatible, as well as possibly seeding some beta releases for users of this library to help test.

Possible implementation

Per the upgrade docs, lit-redux-router would likely need to do the following:

1. Update import statements to reference lit instead of lit-element or lit-html
2. Update package.json to reference a single dependency on the lit package, for both devDependencies and peerDependencies
3. Any additional steps needed per the guide

Alternatives considered

N / A

Additional context

Happy to help test this out and / or contribute! ✌️

[thescientist13]

Looking good! 😄 🌟

• https://github.com/ContributaryCommunity/www.contributary.community/pull/92
• https://github.com/AnalogStudiosRI/www.analogstudios.net/pull/8

[thescientist13]

Just wanted to give a heads up that initial testing looks promising. Can share links once everything is settled.

Thanks again! 🙏