On-deck support for head to head

[jpschewe]

Add a page that one can enter the on-deck teams for head to head.
The user only enters the team number and the other information shows up, like the non-numeric nominees page.

Take the 3rd round off of the head to head playoff brackets page and add the on-deck teams as a fixed column. Display standard team information.

Tasks:

• remove 3rd round
• Add element to display on deck teams
• make on deck element not scroll
• Add page to enter on deck teams - store as application variable
• Update all active displays via websocket
• maybe select matches rather than teams? Will need to figure out how to keep this updated.

Stretch goals

• consider showing table team will be playing on based on current state of brackets - will need to find next bracket for team number
• display 3rd round when on-deck is empty, or perhaps a checkbox if one is using on-deck