[gatsby-remark-images] When using showCaption, parse the caption as markdown

[mathieudutour]

Summary

When using showCaptions: true as an option for the gatsby-remark-images, it inserts the title of the image as raw html.
How about considering the caption as markdown and parsing it before inserting it?

Motivation

mathieudutour/medium-to-own-blog#5

Happy to work on it if that's something that you find interesting

[freiksenet]

It's a good idea. Could you make a PR with that change? I think it should be a new parameter, like markdownCaptions: true, so we preserve backwards compatability.

[mathieudutour]

Sounds good, will do

[jletey]

@mathieudutour If you are busy, I can give this a shot!

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