Add back parallel trim step. Moved fastqc step after trim.

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PR checklist

• This comment contains a description of changes (with reason)
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated
• Replace dag.png with the most recent CI pipleine integrated_pe artifact
• Replace software_versions_mqc.yaml with the most recent CI pipleine generateVersions artifact
• Replace software_references_mqc.yaml with the most recent CI pipleine generateVersions artifact
• CHANGELOG.md is updated
• README.md is updated
• LICENSE.md is updated with new contributors
• Docker images moved to production release and changed in pipeline
• Docker images used in the CI unit tests match those used in pipeline

• Close issue
  Closes #65 (closed)

/cc @ghenry @venkat.malladi