Allow you to get divisions for a specified year
add years variable with TODO

this is harcoded (doing the dumb thing).
Add pagination links for divisions years
centre index pagination (scss only)
add an active style for the current year
remove parliament navigation
add space between year links for when they wrap (scss only)
if no year is selected then we're showing the last year so make it active
show the year in the title unless it is the most recent year
make description copy more friendly
Include divisions held on new years eve :tada:
Include all years since the first division to the last we have
only show the filtering/sort controls if there are division to act on
Allow "all" as a house parameter and always include it in the nav link

This makes it consistent and clear that the house name/parameter is
always present.

The only page we're not explicit on is the main index page. All pages
below that are explicit about what they're displaying in the path.
Allow the date parameter to just be a year
Use helper to display year links
Default to showing divisions from the latest calendar year

Instead of displaying the latest hardcoded parliament session.
Only show year nav link as active if it's set

This means "rdisplay" is still supported and sensibly doesn't
highlight a year on the nav bar. Clicking a year busts you out of that
and into the nicer calendar year navigation.
Make the title read a bit nicer
make the sort button consistent with the house nav