Experimenting with rendering the manual to PDF using rinohtype#270

Draft

rptb1 wants to merge 14 commits intomasterfrom

branch/2023-10-22/rinohtype-pdf-manual

Commits on Feb 22, 2023

Switch the MPS manual to using the Read the Docs theme, to get search capability.
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Using the default MPS logo for the manual, to better match the Read the Docs theme colour scheme.
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Commits on Feb 27, 2023

Improving dependencies so that pip isn't run every time.
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Switching to the Read the Docs theme fixes layout problems described in GitHub issue #121 <https://github.com/Ravenbrook/mps/issues/121>.
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Commits on Feb 28, 2023

Commits on Mar 5, 2023

Commits on Oct 11, 2023

Catch-up merge of master into branch/2023-02-22/manual-rtd-theme
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Commits on Oct 20, 2023

Commits on Oct 21, 2023

Breaking up the glossary index with punctuation and spaces, in response to review <https://github.com/Ravenbrook/mps/pull/166#pullrequestreview-1687977425>.
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Commits on Oct 22, 2023

Adding experimental PDF build of manual using rinohtype <https://github.com/brechtm/rinohtype>.
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