Edit agenda page

[eselkin]

should have

• date
• sections (remove section)
• add section

sections should have:

• items (remove item)
• add item

items should have, but should display initially collapsed (shown in collapsed state *)

• title (*)
• extended title
• tags
• summary
• recommendations (remove recommendation)
• add recommendation
• body
• attachment links (with preview thumbnail and name) (remove attachment)
• add attachment
• references to other agenda items

[eselkin]

As a local council lead, I want to be able to create an agenda with my own organization and headings. I want to be able to add content that is legally required of us. I want to be able to link between agendas and items that reference other items.