Update dependency django-sass-processor to v1.2.1

See merge request !1014

Resolve "Show also group ownerships on person detail page"

Closes #694

See merge request !1094

Update dependency graphene-django to v3

See merge request !1096

Update dependency django-invitations to v2

See merge request !1097

Drop support for GitHub

See merge request !1092

Resolve "aleksis/core/forms.py: Weird phrase in ValidationError()"

Closes #691

See merge request !1091

Resolve "[OIDC] "profile" scope should use avatar instead of photo"

Closes #729

See merge request !1088

Resolve "Support i18n directly in Vue"

Closes #727

See merge request !1086

Fix integration of django-oauth-toolkit with version ^2.0

See merge request !1087

Update dependency python-gnupg to ^0.5.0

See merge request !1081

Update dependency django-oauth-toolkit to v2

See merge request !1017

Remove Django debug toolbar

See merge request !1084

The DJDT is tightly coupled with Django templates, which we will not
use for the frontend anymore.

Rewrite changelog after 2.11 maintenance release

See merge request !1083

Mention 2.10.2 in changelog

See merge request !1082

Bump dev version to 3.0.dev2

See merge request !1080