Rethink design of report

[famosab]

• At the moment tables per benchmark and classification are being produced but not rendered in the report (instead each callset is rendered individually). This could be changed.

• We could also add more visualisations. Or statistics like variants per chromosome.

• Add ability to choose which stratifaction you want to see (only VAF, only coverage, both or None)

• Number of expected variants per Categorie as column