Add PDF render, BOM and so on into the repo

[emilfihlman]

It's better for usability, accessibility and ease of use to have them in repo rather than in release.

[nickray]

One way of doing this is whenever a release is made, create a new directory and copy everything for that release into it (effectively freezing the directory). I think Piotr is doing something like this, https://www.youtube.com/watch?v=UL58tBZbCsQ, but the real talk about Git version control is one of the others from KiCon (which I can't find right now).