Resolve "Update design docs"

This branch merge updates design docs

PR checklist

• This comment contains a description of changes (with reason)
• Documentation in docs is updated
• Replace dag.png with the most recent CI pipleine integrated_pe artifact
• README.md is updated

• Close issue
  Closes #39 (closed)

/cc @ghenry @venkat.malladi

changed milestone to %v0.0.1

added Doing documentation labels

marked the checklist item This comment contains a description of changes (with reason) as completed

marked the checklist item README.md is updated as completed

marked the checklist item *Close issue* as completed

marked the checklist item Documentation in docs is updated as completed

marked the checklist item Replace dag.png with the most recent CI pipleine integrated_pe artifact as completed

@venkat.malladi take a look at the nextflow generated DAG at the bottom of the README.md

Looks great.

mentioned in commit 5b436e02

merged