Convert and concatenate ALFA results for MultiQC report

Currently, results of ALFA are .pdf files. However, the MultiQC report #23 (closed) only support a single .png per section.

Therefore, the ALFA results should be converted with imagemagick container: https://hub.docker.com/r/zavolab/imagemagick and concatenated.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information