Improvements to documentation

Here are some thoughts on things we need to cover in the docs

- [x] Recipes for various setups, e.g. typescript
- [ ] Setting up `babel-plugin-module-resolver` as an alternative to https://blog.callstack.io/a-cure-for-relative-requires-in-react-native-2b263cecf0f6
- [ ] Transpiling modules under `node_modules`
- [ ] More detailed docs regarding how it differs from React Native packager
- [ ] Manually configuring XCode or Gradle to use Haul instead of RN packager

If you have more ideas, please comment below/edit this post if you have access.