Styles UI

[Zilola-Nazarova]

• add basic Bootstrap styles for the layout and existing components
• add markdown formatting support to Collection's description
• create UI for this process:

For example, I want to store a book collection. I can select (add to standard set of id+name+tags) additional string field “Author”, additional text field “Synopsis”, addition data field “Publication Year”.

• render all fields on the item page as well as on the collection page in the list of items (OK, not all of them, let’s say strings and dates)
• add sorting/filtering capabilities for items (and maybe collections?)