Bug fix: Pick first document, not last

The documents within each year are ordered in a descending order
by created_at.
Update state processing for tooltips

"was published late" instead of "was late" and more importantly
"was published on" should not show if the document wasn't produced
(this is a state that shouldn't exist but in case a human error
creates it since 'not produced' is the default state we won't show
it).
Add Open Knowledge logo to the footer of the page