feat: CssSelector everywhere

This MR moves the annotation target selector from untyped id to a CssSelector like we are using for ranges.

also it fixes a misunderstanding of the field textapi where the app version was injected. I set it to 1.0.0.

and also it updates eXist-db to 6.0.1 by using a production ready image provided by @hynek via GWDG harbor.

todo:

• adjust and re-enable unit tests

Closes #250 (closed)

data reimport required