2b6bac4227
Summary: As designed by Vince [here](https://www.figma.com/file/4e6BMdm2SuZ1L7FSuOPQVC/Flipper?node-id=585%3A127550), this diff adds Flipper Doctor into Sandy Note: - The dot on Doctor icon will act similarly to `DoctorBar` - add type to `count` for `LeftRailButton` to act like dot badge - Get rid of padding in `antd` modal Reviewed By: nikoant, mweststrate Differential Revision: D24137349 fbshipit-source-id: 8ce441e0ed96083eba09d98dfd3a45ff9b5be027