Don't close the hypothesis annotation side bar

[tohuynh]

Only close annotation side bar if the users click on the chevron icon

[tohuynh]

@adam3smith Currently not possible to configure this on the Annotation sidebar.

From a Hypothesis dev:

Not yet. We're working on a "side-by-side" mode for web pages that is similar to how it works in PDFs, where the sidebar is displayed alongside the content.