[Ready for Review] Restructure to standalone sections

[masonlr]

Summary

This is a re-work of PR #575. The parent issue is #468.

List of changes proposed in this PR (pull-request)

• Move content into sections (rather than single file)

What should a reviewer concentrate their feedback on?

• Whether the table of contents is correct
• Whether the content has been divided into appropriate sections

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.

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[masonlr]

Note, this PR incorporates the edits made to book/content/reproducible_environments/* by @alexmorley in be9627a

[masonlr]

We've lost the figures in the binder section. Will take a look at that now.

[masonlr]

Moved the images to within the content dir as per #375 discussion.

[rainsworth]

Thank you @masonlr! 👏 I'm going to run through the other PRs to make sure that there isn't any overlap in restructuring currently before reviewing this one.

[kkmann]

yipeeeeh! can be merged, right?

[masonlr]

Up to @rainsworth now.

[rainsworth]

Thanks @masonlr and @kkmann! I just had a few minor comments on typos in the added Singularity content. I will go ahead and approve this because the chapter looks great, and you can merge it in once you've fixed them.

Can I just ask that you please put each new sentence on a new line in the Singularity section? (I know the rest of the chapter doesn't follow this style guideline either, but ignore that for now) - there are just some sentences that are split over several lines in the Singularity section so it would make reviewing easier going forward.

Thank you so much for your contributions to this chapter! 👏

[masonlr]

Can I just ask that you please put each new sentence on a new line in the Singularity section?

@rainsworth I've just run this through prettier.io as per #630. Hope that's okay.