Consolidate redundant create_subscections, and update quickstart

[jswope00]

No description provided.

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[sarina]

Should this quickstart have a seealso that points to the full create_edit_publish_subsections.rst doc?

[sarina]

:ref: cannot have a space between the colon and the backtick. Look at the rendered page: https://docsopenedxorg--795.org.readthedocs.build/en/795/educators/quickstarts/build_a_course.html