Update docs for Docker installation

[metas-Kay]

• DE: https://docs.metasfresh.org/installation_collection/DE/Wie_installiere_ich_den_metasfresh_Stack_mit_Docker.html
• EN: https://docs.metasfresh.org/installation_collection/EN/How_do_I_setup_the_metasfresh_stack_using_Docker.html

see info here: https://github.com/metasfresh/me03/issues/18335#issuecomment-1946044315

@metas-marcus will prepare a revised draft (PR) incorporating his expertise. Thank you for your support!