replaced fake data tests with real functionality

split annotation in taskid and sasid to preserve the remarks on both levels, and add sasid remarks to tasks.

added filter for description
added description to GUI
added migration file
updated documentation in README.md

improve Quality page

added Retry button to Task page

removed 'regular' filter from API task list

add service monitor to monitoring page

add service monitor to monitoring page

add service monitor to monitoring page

monitor endpoint and database change

https://support.astron.nl/jira/browse/SDC-475

(and to read serializer, not yet to write serializer)