The rules (`pca_salmon`, `pca_kallisto`) generate the PCA results for genes and transcripts. The plots should be integrated into multiqc and not as custom plots as we have them now. This involves: - [x] Add code to generate the plots in https://github.com/zavolanlab/multiqc-plugins - [x] Use the new Dockerfile in zarp and adjust Snakefile (wiring of rules)