liran-funaro / sphinx-markdown-builder / 39925392485

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Render figure captions and legends (#76)

## Summary

Figure captions and legends were previously unsupported: `caption`
emitted an
`unknown node type` warning and its text was dropped, and so was the
`legend`
content.

This renders:

* Figure captions as emphasized text, in a paragraph of their own
* Figure legends as normal body content

```rst
.. figure:: /static/markdown.png
   :alt: Markdown logo

   Figure caption text.

   Figure legend paragraph.
```

becomes:

```markdown
![Markdown logo](static/markdown.png)

*Figure caption text.*

Figure legend paragraph.
```

Split out of #63 as requested in review, to keep that PR focused on
abbreviations.

3 of 3 new or added lines in 1 file covered. (100.0%)

778 of 792 relevant lines covered (98.23%)

2.95 hits per line