Resolve "[Settings] Support config files in sub-directories"

Closes #548

See merge request !790

Resolve "Fix notifications on the dashboard"

Closes #540

See merge request !785

Resolve "Use @materializecss/materialize instead of materialize-css"

Closes #544

See merge request !786

Update dependency django-allauth to ^0.46.0

See merge request !784

Prepare release 2.1.1

See merge request !781

Merge branch '541-base_print-html-doesn-t-uses-correct-site-preferences-if-run-in-background' into 'master'

Resolve "base_print.html doesn't uses correct site preferences if run in background"

Closes #541

See merge request !777

Update dev dependencies

See merge request !779

Resolve "[OAuth] Endpoint URLs broken in recent refactoring"

Closes #537

See merge request !775

Resolve "Form and model extensions imported in wrong order"

Closes #538

See merge request !776

Merge branch '538-form-and-model-extensions-imported-in-wrong-order' into 537-oauth-endpoint-urls-broken-in-recent-refactoring

Update django-titofisto to support public namespace

See merge request !771

Resolve "Left-over code from optional Celery"

Closes #536

See merge request !773