Render themeroller rollyourown template on frontend

- Split rollYourOwn groups into its own partials, reducing the overall template
  HTML;
- Backend serves the rollYourOwnObject so frontend can render (TODO: move this
  logic to frontend as well);
Render themeroller rollyourown template on frontend (entirely, no server needed)

- Finish porting all rollYourOwn rendering to clientside;