Add breadcrumbs for other manuals

- remove breadcrumbs from immigration
- use the manual in the document presenter to contruct breadcrumbs
- only use document['details']['breadcrumbs'] if present
- add index.html.erb for a manual index page
- add section groups and presenter to manual presenter

The document['details']['breadcrumbs'] makes it so that if we
don't send the breadcrumbs in the response, it will just construct them from
the manual.url > document.url. Add index.html.erb and manual presenter
was needed as the show.html was going to start getting more clogged with
conditionals.