This page is a rubricator of all groups of the goods that will be mentioned in the catalogue.
Each group may content:
1) a title of a group of goods
2) an illustration (an icon of the group)
3) a list of title-links that lead to the subgroups of the goods or specific names of goods themselves.
In the administration system a page of the "Content" type can be attached to each group.
The site administrator can add/delete/edit titles of groups and subgroups and illustrations.