Bureau structure page

- Add bureau structure page contents.
- Add content slider functionality for mobile org chart.
- Add jump-link__back & jump-link__bg modifiers.
I don't think this is matching anything. And if it did it's a pretty gnarly selector, I think it renders out to `.org-chart_node .org-chart_nodes .org-chart_role ~ .org-chart_node .org-chart_role`.