moves the bootstrap data to dal/bootstrap.py to make it more
convenient to edit. Changes menu object to have a structure and
sections that have item ids so that item details can be obtained from
the DB later. Adds a section view that lists the items in a
section. Navigation can go nwo from the main menu, to a section, to an
item detail.

known issues: main menu shows section numbers and not section
names. All sections for now show all items as there's not enough items
in the bootstrap data to make it look realistic. Navigation back to
the main menu from an item or section seems to affect the style.