Add Methylation to LGAT subtyping chart

[sickler-alex]

What data file(s) does this issue pertain to?

https://raw.githubusercontent.com/d3b-center/OpenPedCan-analysis/dev/analyses/molecular-subtyping-LGAT/plot/LGAT_subtyping_workflow.png

What release are you using?

None

Put your question or report your issue here.

Add methylation subytping to the LGAT subtyping flowchart.

[jharenza]

closed with #536