Merge pull request #23 from node13h/release-21

Version 2.1.0

Merge pull request #21 from StevenMapes/master

Correcting the version

Fixing import

Fixing the import of Django

Signal no longer uses the args

Django 4 no longer need this

Updating the translation for Django 3,2+

Merge pull request #17 from PetrDlouhy/trace_nodes

fix error if there is no nodelist

fix timeline position

make timeline breakup space height adaptable on it's content

add hover action that highlights timeline item

use djdt default toggle element instead of custom made