Resolve "Fix circle icons"

Closes #323

See merge request !400

Sizing of dashboard widgets

See merge request !410

Resolve "Frontend for DashboardWidget creation"

Closes #314

See merge request !409

Resolve "Fix PWA offline fallback page"

Closes #324

See merge request !405

Move offline fallback page template direction to make it accessible by django-pwa view, remove custom view from views and urls

Important: Doesn't include support for ordering or sizing yet

Resolve "Add sortablejs"

Closes #326

See merge request !408

Add aleksis-admin script

See merge request !407

Currently translated at 14.6% (53 of 363 strings)

Translation: AlekSIS/AlekSIS-Core
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis/la/

Currently translated at 100.0% (363 of 363 strings)

Translation: AlekSIS/AlekSIS-Core
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis/de/

Resolve "Test django-cachalot"

Closes #310

See merge request !379

Reformat README. Advances AlekSIS#1

See merge request !406

Resolve "Review and fix/improve PWA behaviour and serviceworker"

Closes #230

See merge request !336

Stop promoting a specific TOTP app

See merge request !404

Fix celery usage in system status page after celery upgrade

See merge request !403

Update dependency Pillow to v8

See merge request !393