Celery can now be started together with uWSGI if one wants to do that

I have no idea why…

Move trigger job to deploy stage

See merge request !520

Trigger dist pipeline on master

See merge request !519

Update django-uwsgi-ng dependency to 1.0.2

See merge request !518

Render line breaks in notification descriptions as <br> tags

Closes #402

See merge request !517

Set correct scheduler in celery beat when run in dev mode

See merge request !516

Use uWSGI in Docker

See merge request !515

Resolve "Allow defining inital admin credentials from outside"

Closes #399

See merge request !514

[CI] Ensure PyPI and docker builds are run in correct order

See merge request !512

Move cache and session store to Redis

Closes #385

See merge request !508

Resolve "[Docker] Provide AlekSIS base image"

Closes #398

See merge request !511

Switch to django-uwsgi-ng and update poetry.lock

See merge request !510

Resolve "Use uwsgi in development"

Closes #360

See merge request !468

Closes #385

Removes memcached support. As Redis is mandatory for Celery now, there
is no benefit in supporting memcached on top.

Add preference to enable/disable dashboard editing

Closes #395

See merge request !507