Description and reviewer info

Closes #255, fixes #291

The purpose of this PR is to migrate nf_wgs over to DSL2. This does not entail corralling the processes into workflows.
A few processes have been removed, such as the melt_qc_val. Annotation only runs will need to be re-added in some future PR.

Type of change

• Documentation
• Patch
• Minor change
• Major change

Checklist

• Self-review of my code
• Update the CHANGELOG
• Tag the latest commit (vX.Y.Z format)

Major / Minor change

• Stub run completes without errors or new warnings
• GIAB single (wgs) finishes and differences to current master branch have been investigated (using PipeEval)
• GIAB trio (wgs) finishes and differences to current master branch have been investigated
• Seracare (onco) sample finishes and differences to current master branch have been investigated
• Output from processes with altered code have been inspected (i.e. in the work folder: .command.sh, .command.log, .command.err and result files)
• All three samples can be loaded into Scout
• test mody sample
• test myeloid-const (does the no-sv loqus workaround still work?)
• At least one other person has reviewed and approved my code
• I have made corresponding changes to the documentation (software versions, etc.)

Test/review documentation

Review performed by

• Alexander
• Jakob
• Paul
• Ryan
• Viktor

Testing performed by

• Alexander
• Jakob
• Paul
• Ryan
• Viktor