severe plots for ENSEMBLE

[benkeser]

• Peter needs to update mock data to include severe endpoint indicator
• resolved in 067a9a9
• Yiwen needs to add severe endpoint indicator to the real data
• Yiwen needs to update cor_graphical to adjust violin plot code to include figures of antibody levels by severe endpoints

[yiwenlu]

@benkeser real data have been updated with severe endpoint indicators. Could you remind me if Peter meant extra figures by severe endpoints (severe vs non-severe) or extra figures just for severe endpoint cases?

[yiwenlu]

severe only figures have been added for ENSEMBLE @benkeser