[develop]: Update container docs w/multi-node Rocoto option

[gspetro-NOAA]

DESCRIPTION OF CHANGES:

This PR:

• Updates the Container chapter of the documentation to reflect the new process for running a container across nodes and with Rocoto.
• Moves info on running with standalone scripts to the BuildRunSRW chapter's "Run" section.
• Fixes minor details noticed elsewhere in the documentation (e.g., --rrfs option not rendering correctly on RTD).

Type of change

• This change requires a documentation update

TESTS CONDUCTED:

None required. The process worked for @mark-a-potts and me on the following platforms:

• hera.intel
• orion.intel (did not attempt due to the cron/login-1 node requirement)
• cheyenne.intel (Mark)
• cheyenne.gnu (must use Intel compiler w/this container-explained in requirements section)
• gaea.intel (singularity not installed/container not supported)
• jet.intel
• wcoss2.intel
• NOAA Cloud (AWS, Azure)

DEPENDENCIES:

N/A

DOCUMENTATION:

All documentation!

ISSUE:

Resolves Issue #338

CHECKLIST

• My code follows the style guidelines in the Contributor's Guide
• I have performed a self-review of my own code using the Code Reviewer's Guide
• I have commented my code, particularly in hard-to-understand areas (N/A)
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes do not require updates to the documentation (explain).
• My changes generate no new warnings (N/A)
• New and existing tests pass with my changes (N/A)
• Any dependent changes have been merged and published (N/A)

CONTRIBUTORS (optional):

@mark-a-potts