See https://github.com/hypothesis/product-backlog/issues/350

Add config options for the following:

disableToolbarCloseBtn: false/true
Disables and hides the close button on the toolbar

disableToolbarMinimizeBtn: true/false
Disables and hides the minimize button on the toolbar

disableToolbarHighlightsBtn: true/false
Disables and hides the highlights button on the toolbar

disableToolbarNewNoteBtn: true/false
Disables and hides the new note button on the toolbar

disableBucketBar: true/false
Disables and hides the bucket bar

enableSidebarDropShadow: true/false
Turns on the dropshadow for the sidebar

theme: 'clean'
Turns on the 'clean' theme for the sidebar. By default the classic view(with annotation cards) is turned on, which the rest of the Hypothesis users will see.

usernameUrl: 'someurl/'
The url to direct a user to when their username in the annotation is clicked.