Integrate LUX Design System

[tpendragon]

https://github.com/pulibrary/lux

We should be able to use Vue tags in our .eex files to add things like Princeton's header/footer.

[jrgriffiniii]

I'm not certain how we would integrate tests for this. https://github.com/elixir-wallaby/wallaby looks to be a promising package.

[jrgriffiniii]

I've gotten LUX functioning with https://github.com/samvera-labs/digital_collections_elixir_example/compare/test-lux

[jrgriffiniii]

Once #14 is merged, I'm not certain that there is much outstanding for this.