update pypi repo url

See merge request !438

changed rockylinux tag to rockylinux:8

See merge request !437

fixes issue #519 , enables adding phone number to subject columns

Closes #519

See merge request !432

fixes #520 , adds worker assigned (if any) to the tooltip information in appointment calendar

Closes #520

See merge request !434

this changes prevents trying to replace placeholders not used in the file....

See merge request !431

Fix/502 - vouchers hours can be negative value

Closes #502

See merge request !435

Fix/513 - change import on export

Closes #513

See merge request !436

removes alpha from title

Closes #521

See merge request !433

Feature room planning

See merge request !430

this changes prevents trying to replace placeholders not used in the file. However, if a field value is None it will still fail. We need to discuss the approach to follow if a required field is none, should it be replaced by the text None or how can we propagate an error to the frontend?

subject_type was not retrieved from the given ID in the URL. fixes #516

Closes #516

See merge request !429

added placeholder and warning if no date is provided on recurring events

See merge request !428