Fix metals plot

[guillecg]

• [x] Add the parameter to use log or percentage
• [x] Remove [ppb] from axis
• [x] Add absolute stacked bar plot on top of this one (check geom_col)
• [x] Set blank as the first sample

[guillecg]

Solved in e4991ac2bdef4c3f70227c38099727278e416f09