attributions for photos

[juniperlsimonis]

we should have proper attributions / credit for the photos on the rodents page.
@gmyenni @henrykironde where did those pics come from (the ones being used on the website)?
can one of you add a column (or more if needed) to the csv in the inst/app/www folder that has the rodents photos information that includes where the photos come from and who took them? also if there are copyrights, etc. we need to mind those.