Implement polyglot documents

Daniel Silverstonerequested to merge
polyglot-docs into main

Description

As the next step in making Subplot more internally consistent and more capable of working with projects which are multiple-language, this MR provides polyglot documents which is the major component of Goal 2 of the project.

Extension/cleanup work could include deduplicating the runcmd and files subplots and ensuring that the subplotlib tests are generated using subplot-build (#242 (closed)), however that's out of scope for this MR.

closes #198 (closed)

Checklist

  • You have read, and followed the guidance in, the CONTRIBUTING guide
  • The MR content has run through a pipeline, or at least has pipelines enabled.
  • There are no licence concerns with this contribution (The README clearly states Subplot is MIT-0)
Edited by Daniel Silverstone

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