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* Various documentation changes, mostly ported back from the ``submitr`` fork:
* Change Submit-CGAP throughout to SubmitCGAP for internal branding consistency.
* Small wording changes for clarity, especially in Overview.
* Fix some ``.rtf`` syntax errors (especially uses of single-backquote where double-backquote required).
* Clearer section names.
* "Installing Prerequisites" (instead of "Basic Setup") for clarity about what content to expect.
* "Using SubmitCGAP" (instead of "Getting Started") again for clarity.
* "Implementation of submit_cgap package" instead of "submit_cgap package" so that the user is less likely
to feel they need to understand this section to use the tool.
* Put information about ``rclone`` at the end, and make it clear that it's an alternative to using this tool
rather than the main documentation of how to use this tool.
* Put subpackage information at the end of package list, not at the beginning.
* Don't show package content ``submit_cgap.tests`` or ``submit_cgap.scripts`` (which would show info from
``__init__.py``, which we don't do). This avoids some useless/confusing section headings.
* Add some additional ``Makefile`` recipes, most importantly ``make preview-locally`` to preview what Sphinx
will do on ReadTheDocs.
* Backport some improvements to GithubActions (GA) workflows that were debugged for ``submitr``.
* Use ``make build`` rather than explicit ``poetry`` initialization (to avoid extra dependency on version).
* Use ``ref=`` instead of ``branches=`` when submitting a doc build job.
* Trigger auto-build of doc on any non-beta checkin.
(For betas, use the new ``make preview-locally`` since
the recipe for building will just build from master and
doesn't parameterize the branch.)