The schedule is represented as a YAML document containing a list of slots. Each slot has a "type", "start_time", "end_time", and if the type is "talk", a "talk_id" corresponding to one of the talks in /_talks
Navigation bars are represented as YAML documents containing a list of page IDs. Page IDs are defined at the top of the page templates themselves (see schedule.html for an example)
When editing through the GitHub interface, follow the instructions in the README for Content Editing