make DOI more prominent, and give context

[d-v-b]

• provide a description for each DOI hyperlink that indicates what that hyperlink points to (e.g., "a DOI hosted on figshare for the reconstructed EM data")
• Explicitly indicate that people wishing to cite that dataset should use these DOI

[d-v-b]

also, the DOI hyperlink should take the form doi://blablabla, and so we need two pieces of text for each DOI that we display, a human-readable piece of text and the doi://blablabla link