Implement support for Docker in rootless mode

[mfhepp]

Basically, implement the lessons learned in

https://github.com/mamba-org/micromamba-docker/issues/407#issuecomment-2088523507

• update run_script.sh
  • check if rootless
  • check if podman is available
  • check if conditions are met if podman is not available
  • start container with proper options
• update documentation

This will ideally be done after a cleanup that will remove the -D option and externalize the notebooks feature (and replace build.sh by a Makefile).

[mfhepp]

Check for rootless: https://sthbrx.github.io/blog/2023/04/05/detecting-rootless-docker/

[mfhepp]

Check for sudo: https://stackoverflow.com/questions/64848619/how-to-check-if-user-has-sudo-privileges-inside-the-bash-script