Removing the initial setup

[gwennlbh]

The goal is to make the first experience more pleasing, by letting users wonder around the interface, and suggesting them to fill out the information (either implictly by having sections empty/not available or explicitly with a banner atop the interface).

Here are the different setup steps that need to be dismantled and handled in the application itself:

• having no subjects
  pretty easy, I'm wondering if it doesn't already work
• having no schedule events
  needs some major work on events.js and a little on <Schedule>
• having no settings set
  using default values makes sense
• having no dates for the schedule
  this seems to be the most complicated to implement