Migrate examples

[stefvhuynh]

• Migrates codesandbox examples to this repo
• Converts them into typescript

TODO before merge

• We need to figure out the developer experience. In order for this to work in code sandbox, the examples/ folder needs to be self-contained with it's own package.json. As such, we need to import react-swipeable from npm instead of just importing from src/. Thus, in order to develop on the examples, a developer needs to either yarn link the package or change the import manually. However, we then get extra copies of react errors. We should sort this out before merging.