Update flow chart

[constantinwolff]

The current flow chart in the methods section needs to be updated.

TODO:

• normalize the figure style
• define high-evident genes as >= 2
• define low-evident genes as < = 1 (0 and 1) and explain evidence criteria = 0
• implement 7. phenotype "metabolic kidney disorders (including monogenic urinary stone disorders)" as selection option in the group, even think about considering the 8 phenotypes regarding this publication: A Clinical Workflow for Cost-Saving High-Rate Diagnosis of Genetic Kidney Diseases
  
• correct first evidence criteria in the timeline after merging and add a new merged table
• give only 4 options for curated classes in the example Gene --> change Refuted to No-Known Disease Relationship