refs #219

refs #219

refs #284

The navigation logic was extensible but also a bit overengineered for
our purposes and kind-of invented a DSL for generating nav entries. We
should be better off with a more direct approach.

Now that bootstrap-vue is no longer used we can finally deactivate the
Vue 2 compatibility mode.

This is a big one because it’s hard to make these kind of changes
atomic. This changeset reworks the calendar component which is no longer
dependent on bootstrap and vuex.

As a consequence we can remove axios, bootstrap, and vuex because the
calendar was the last remaining part of the code that was still using
them.

refs #127 #140 #261 #279

refs #247

refs #181

We often find ourselves adding flex styles to buttons. Instead, this
should be the default.

fixes #199

fixes #203

fixes #209

refs #127

refs #181

Until now the show context menu was only displayed when user’s were
visiting routes for that particular show. As we keep a global show
selection state, we can display this context menu at any time, because
the state is not unset when users visit other dashboard sites.

At least for now that makes sense.

This refactor includes a bulk of the changes discussed in #181. It
removes the existing navbar and replaces it with a sidebar instead. This
leaves us more room for context-aware navigation options and other
information that is relevant to users.

Additionally, the show management page is now split up into two, the
show episodes management, listing the coming shows/timeslots and the
show’s schedules, and the show basic data page, that contains all mostly
static data for a show and which is usually maintained by
administrators.

refs #181