Branding support

[trajano]

Is your feature request related to a problem? Please describe.
Right now it's hard coded to use story book logo and brand text

Describe the solution you'd like
Get branding to work
Also get branding to use React Native image resources

In case anyone wants to create the PR feel free to use these patches

• https://github.com/trajano/expo-experiments/blob/master/patches/%40storybook%2Breact-native-theming%2B8.3.9.patch
• https://github.com/trajano/expo-experiments/blob/master/patches/%40storybook%2Breact-native-ui%2B8.3.9.patch

[dannyhw]

Totally open to adding branding support, will investigate

[trajano]

I suggest you choose a proper theme color I am pretty sure me being color blind I'd choose a ghastly one.