Dashboard custom buttons

Closes #17

See merge request !9

fix typo

Introduce model
Introduce admin interface
Show buttons on dashboard start page

Add little space between the buttons

New features

See merge request !8

deploy dashboard under /
create template view
provide template with important links for each event
handle case of no events
create template tag to ensure installed apps

maintaining naming convention

Add new property to model to simply access planned durations of AK

Add contact email address to event model
Show email link in footer
Fix missing event reference in AKDetailView

The subfolder is not under version control, however, you can place another version controlled source here if needed

prevent jetbrains IDE from omitting this import