fixes #87

Making imperative DOM API calls to apply CSS classes is
counter-productive when using a reactive frontend framework like Vue.
DOM attributes should instead be assigned based on reactive data.

fixes #117 and #118.

Notable changes:
 * Vue 2.6 to Vue 3 + compat migration.
 * Build system migration from vue-cli/webpack to Vite.
 * Application dependencies like bootstrap-vue, vue-router, vuex,
   or vue-toast-nofitication have been updated, if doing so was
   necessary or advisable for the Vue 3 migration.
 * Static file includes for the oidc-client in oidc_callback.html
   and oidc_callback_silentRenew.html have been removed in favor
   of automatic processing in the build system so that all assets
   are versioned and invalid cache hits are prevented.

Fixes #53 and #110.

moment is still needed as peer dependency but we should’t use it in our
own code anymore so we can remove it in the future.

We explicitly pass authorization for all requests and so no implicit
credentials need to be passed.

This reverts commit d37643bd.

This reverts commit 618bef34.

This reverts commit 4a37062d.

feat(nginx): deploy dashboard standalone

Closes #105

See merge request !12

Nginx in the Docker-container now ONLY deploys dashboard on
port 80. All configs related to other services will be moved to a
separate container. Certbot has been removed from the Dockerfile.

Fixes #105

This reverts commit 03470ca4.

Fix error code handling for scheduling API

Closes #93

See merge request !11

Allow API store consumers to use traditional flow-control

See merge request !10

Update toolchain and cleanup code

See merge request !9

The steering API returns HTTP 400 errors for general payload and 409
errors for scheduling conflicts that we didn’t handle yet.

fixes #93

A simple b-alert list wrapper that handles the standard error format
from Django REST framework.

Views may want to display a fallback message if the translation key does
not exist.