add links to urdfs and fix image carousel link

[chennisden]

Adds links to urdf in listing

[chennisden]

i think the image carosuel is a bit big but this is just inherently due to the size of the image. (1536 x 1536 is a little COMICALLY big)

[chennisden]

new changes:

• as the commit msg implies i have removed caroseul when no artifacts present
• urdf downloaded filename now matches displayed filename, instead of having the downlaoded filename be some horrid-looking uuid. (this makes behavior more predictable for scripts, which is awesome because now script can just look for first urdf, download, and filename is precisely what you expect it to be!)

thoughts: if you want to have a feasible, understandable bash script, for "fetch latest urdf + do stuff with it" (as almost every project in this company seems to required), you are really going to want a specific path just for getting the latest urdf from a certain listing. these parsing/filtering things in bash are very nontrivial to say the least