Dark & Light mode for integrations#478

Our app has both a dark mode and light mode option, however, we can only integrate Nolt with a single mode.

So currently we have integrated in light mode, but when the user switches our app to dark mode, Nolt remains in light mode.

It would be good when a user switches our app to dark mode, we can also switch Nolt to a dark mode (colours set in our settings).

@Gary thanks for the suggestion! We will discuss this internally.