Add Figure 1 legend

[sjspielman]

Closes #10
This PR adds the legend for Figure 1. I placed (edit) it** in a file for figure/table legends that is numbered 100 to appear as the last file in the build.

Here is figure 1 for reference: https://github.com/AlexsLemonade/scpca-paper-figures/blob/2ebc50dd2c9071ceb2487d97b9daaf52f7c11826/figures/compiled_figures/pngs/figure_1.png

Questions for reviewers:

• Is 100 the right order here, or should it be moved up before references?
• More/less detail anywhere?
• I struggled a little bit to clearly explain the colors in panel B and how modalities relate to the "all samples" bar. How did I do?

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[jaclyn-taroni]

👍🏻 LGTM

[jaclyn-taroni]

I know I approved this already, but can you put the figure itself in the figure legend (towards #48)? (This applies for all future PRs as well.) I know we don't have the final.final commit for the figures, so perhaps we want to use main for now and file an issue tracking updating to use a tagged release?

[sjspielman]

I know I approved this already, but can you put the figure itself in the figure legend (towards #48)? (This applies for all future PRs as well.)

Do you mean, reformat the figure legend (still in its own file) to literally be written out as something like this?

![Caption for the example figure.](url_or_path_to_figure){#fig:example-id}

I know we don't have the final.final commit for the figures, so perhaps we want to use main for now and file an issue tracking updating to use a tagged release?

This makes sense to me, I'll open the issue.

[github-actions]

Click the link below to download the manuscript build as a ZIP file.
This build is associated with commit 9a4a2bf.

Manuscript build

[github-actions]

Click the link below to download the manuscript build as a ZIP file.
This build is associated with commit a3b832a.

Manuscript build