Add addon-link example to react-native

[shilman]

why

At some point the links addon demo was removed from the RN boilerplate (CLI templates, example apps, etc.)

what

• Add back addon-links demo to Welcome
• Fix up prop-types
• Remove preventDefault which is unnecessary in RN

See #1568 (comment)

[stale]

Hi everyone! Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. Unfortunately, we don't have time to get to every issue. We are always open to contributions so please send us a pull request if you would like to help. Inactive issues will be closed after 60 days. Thanks!

[stale]

Hey there, it's me again! I am going close this issue to help our maintainers focus on the current development roadmap instead. If the issue mentioned is still a concern, please open a new ticket and mention this old one. Cheers and thanks for using Storybook!