Integrate react-bootstrap toolbar into build

The version of the react-bootstrap toolbar that I brought into our build used a separate build process, and then the resulting transpiled files had to be copied into our build tree. This modification brings those files into our build directly so that separate process isn’t needed anymore.

I’d like to use the react-bootstrap navbar that’s in the npm in our build, but there doesn’t seem to be any way to set a data attribute on the navigation <a> elements with that version, so the Sign In / Sign Out menus don’t work.