Update Figures page

[naushinthomson]

• [x] Add instructions on how to download earlier versions of figure files uploaded to Kriya
• [x] Fred approved page
• [x] James approved page
• [x] Naushin approved page
• [x] Rebecca approved page

Definition of done

• [x] Team reviewed and approved page?
• [x] Add changelog to page

[JGilbert-eLife]

https://elifeproduction.slab.com/posts/figures-and-figure-supplements-8gb4whlr#homwa-accessing-older-versions-of-figures