Integrate PCA plot in multiqc report

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:

Add code to generate the plots in https://github.com/zavolanlab/multiqc-plugins
Use the new Dockerfile in zarp and adjust Snakefile (wiring of rules)

Edited Mar 26, 2021 by BIOPZ-Bak Maciej

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