Update Figures page

[naushinthomson]

• [x] Add updates to page to include workflow for fig quality (e.g. rasterisation/embedded images in PDF figure files/conversion issues/offline PDFs)
• [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]

OK, I think this is good for checking: https://elifeproduction.slab.com/posts/figures-and-figure-supplements-8gb4whlr#h1s25-resolving-figure-quality-issues

[fred-atherden]

This is really great work, thanks @JGilbert-eLife. It's so thorough and extensive I have nothing to add!

[rkcook312]

Had a read through, looks all good to me, nothing more to add from me, thanks!