Update toggle with new styling, add big toggle

Created by: AlicjaSuska

Small toggle

Toggle styles require updating as per the following component system update proposal:

https://www.figma.com/file/HWLuLefEdev5KYtoEGHjFj/Sourcegraph-Components-Contractor?node-id=972%3A308

Big toggle

A new big toggle component needs to be created (see the proposal above). It will be used in the headers of the extension details page.