Update singularity documentation to account for migration from modules to node-local install of 4.1.2

[wwarriner]

What is inaccurate?

We are retiring old singularity versions as we roll out version 4.1.2. We will want to be sure to document the changes required for workflows. Old singularity uses the module system. New singularity is installed and available in $PATH. So, the only system change is to remove module load Singularity as it will no longer function and throw an error.

There may be other changes involving version changes with Singularity. Here is the changelog for 4.0: https://docs.sylabs.io/guides/4.0/user-guide/new.html

Where is the inaccuracy?

Possibly affected pages

• https://docs.rc.uab.edu/uab_cloud/installing_software/#installing-singularity
• https://docs.rc.uab.edu/workflow_solutions/getting_containers/#running-singularity-images
• https://docs.rc.uab.edu/education/case_studies/#parabricks-4x-installation-on-cheaha

[wwarriner]

GitLab issue here: https://gitlab.rc.uab.edu/rc/cluster-software/-/issues/115