wrong link in readme

the readme states Clone the repository into arviz_godot:

git clone --recursive git@gitlab.com:ArmarX/core/arviz-godot.git arviz_godot

but the link should be git@git.h2t.iar.kit.edu:sw/armarx/core/arviz-godot.git

created branch 249-wrong-link-in-readme to address this issue

mentioned in merge request !157