create a schedule planer

[aoloe]

• create a page template with fullcalendar.io
• get a list of unplanned items (per day?)
• store the planned dates and times in the talk
  • store the end date when it's not 20 minutes
  • resize entries
  • show colors for categories
  • unplan entries
  • make sure that the timezone is correct in .js (it should be GMT+0)