Update procedure for building SCM for spack-stack, clean up existing build procedures

[mkavulich]

• Convert shell scripts to modules (if possible)
  • Derecho, Hera: Add module files for building SCM with spack-stack on Derecho, Hera, Jet, Orion #406
  • Linux, MacOS: Update docker container, add Docker auto-build and test, update documentation for building with spack-stack #466
• Update Users Guide for the new build procedures Update docker container, add Docker auto-build and test, update documentation for building with spack-stack #466
  • Point to relevant documentation for spack stack
  • Update/rethink example submission scripts
• [ ] Update online tutorial will be addressed by Determine which training materials will be created and/or updated (e.g., videos, tutorial) #456

[mkavulich]

Just updating my progress: I have begun updating instructions for pre-installed platforms (Hera, Derecho) but have been hitting a wall when I attempt to make a fresh install of spack-stack on MacOS to test that procedure. I have opened a discussion in the spack-stack repository to hopefully get some help with this.

[mkavulich]

Another update: I managed to successfully build spack-stack v 1.6.0 on MacOS, and successfully built and ran the SCM using those libraries!

I am currently working on converting the documentation to auto-build on ReadTheDocs (#418), and once that is complete will incorporate instructions there.