brms tutorial: figures missing

[falkmielke]

This repo does not contain all the image files for knitting the html's of the r_brms tutorial.
The files missing are:

• mcmc4b.png (source unclear),
• software.png
• loocv.png
• k-foldcv.png

@raiisac I am guessing that you have the originals; it would be great if you include them in a static folder (ideally as vector graphics, such as svg).

For now, I downloaded the files from the existing tutorial.
(low priority)