change hypothesis support toggle to default to on
change hypothesis support toggle to default to on

 * This is safe to turn on by default; it only adds a few extra lines
   of code to the pdf render template.  The hypothes.is sidebar still
   has to be manually started by the parent frame.

felliott/modular-file-renderer,CenterForOpenScience/modular-file-renderer,felliott/modular-file-renderer,CenterForOpenScience/modular-file-renderer,CenterForOpenScience/modular-file-renderer,CenterForOpenScience/modular-file-renderer,felliott/modular-file-renderer,felliott/modular-file-renderer