refactor: #499 rename sdpi-supplement to sdpi-standard in directory a…

[d-gregorczyk]

☑ Mandatory Tasks

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[ToddCooper]

@JavierEspina & @d-gregorczyk -- Moving comment thread from Issue #499 ...

Notes from initial refactoring:

Comment: Jetlag is a bear ...

1. Bifurcating SDPi to Supplement & Standards

   • Duplicated sdpi-supplement.adoc to sdpi-standard.adoc
   • Updated sdpi-supplement to include only -intro & -issues + defined the section labels currently required to resolve references from these two includes
   • Editorial comments added to document (both source - not rendered, using "STANDALONE SDPi:" - search for this for refactoring notes
   • Review ballot comments - rendered - using "Standalone SDPi" for review
   • PRIMARY CHANGES will be made to the front matter, including the -issues and -intro files, but "supplement" is included randomly throughout the other files and will need to be updated to "standard" or "document" (neutral) when other major changes have been completed.

2. Deferred until integration of other PRs:

   • Retained "supplement" use in the sdpi-standard files until other PRs have been merged, due to the significant changes that this will result in throughout most files! THIS IS A HUGE CHANGE, since many labels include "supplement" somewhere!
   • TF Volumes - keep? For this version, I kept the TF-1 to TF-3 designations; however, since this will NEVER be integrated into a Mothership Final Text Technical Framework "document", should we keep the "volume" designations or make them "Sections"? I'd favor keeping them Volumes but am open to other approaches.

The latest PR content builds - but much work remains!