Install and configure gatsby-remark-copy-linked-files

[mstenta]

This adds the gatsby-remark-copy-linked-files plugin.

Copies local files linked to/from Markdown (.md|.markdown) files to the public folder.

This is necessary for non-image files, which are currently handled for us by the gatsby-remark-images plugin. Notably, the gatsby-remark-images mentions the gatsby-remark-copy-linked-files plugin is necessary for image types that it doesn't handle:

Since Sharp is used for image processing, this plugin will not support GIFs or SVGs. If you would like to render these file types with the image markdown syntax, use the gatsby-remark-copy-linked-files plugin. Do note with this it will load in the images, but won’t use the features of Sharp such as the elastic container or the blur-up enhancements.

The motivation for this PR is so that we can include MP4s in blog posts. I explored the various options and considerations for this in #75.

In the future, we may also want to add the gatsby-remark-videos plugin, which automatically handles/converts/resizes video files similar to the way that gatsby-remark-images works. The gatsby-remark-videos plugin also mentions the need for gatsby-remark-copy-linked-files in its docs:

Also make sure you have a plugin that copies the files you are referencing, for example gatsby-remark-copy-linked-files.

So it seems that this plugin (gatsby-remark-copy-linked-files) is the standard way to handle copying linked files.

I expect that this will work naturally with both our gatsby-source-filesystem plugin (which sources files from this repo), and our gatsby-source-git plugin (which sources files from remote repos like farmOS-community-blog).

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