PEP 1, 12: Update for adoption of PEP 676, and fix a few related items #2447
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Followup to PR #2399 , which officially moved us over to the new Sphinx-based rendering system proposed in PEP 676.
Updates PEP 1 and 12 to update outdated references to Docutils and the Docutils-based rendering system to refer to Sphinx, ensure the guidance related to the rendering workflow is up to date with current practice, improve the description of and links to help resources. Also, fixes a few minor issues in the Readme introduced by that PR and updates the hardcoded PEP link checker to detect the new URL as well as the old (avoiding it missing them like in #2444, and even I myself not noticing in #2428).