CI Improvement: Pull BOM from Lumen repo for up-to-date hover photos in docs

[gabeseltzer]

We discussed that it would be nice for the Docs project to pull the latest BOM and photos so that we can link to it in the docs and can use the photos. The idea would be to replace the current hover-text snippet we use to show part numbers (which are now gone) and instead have the hover snippet show the relevant photo of the printed part, as well as be a link to the BOM hosted on the docs site so that people can see what the part is, download the .stl, etc.