Add reichsanzeiger gt (#5)

* feat: add Reichsanzeiger-GT to prepare.sh

* add Reichsanzeiger subsets

* add download for Reichsanzeiger subsets

* add first draft for reichsanzeiger gt

* extract sample bundles

* update .gitignore

* clean up

* tidy up project root

* tidy up volumes

* update README

* update data

* build: roll back to version where cis runs still runs

* build: remove default model mounting