Add more cromwell and sprocket info

[emjbishop]

URL of existing content (a rendered, sciwiki.fredhutch.org link)

https://sciwiki.fredhutch.org/datademos/wdl_execution_engines/

Specific information requests or concerns, or specific region on page of content to refresh.

As someone who tried running a WDL on the cluster (without PROOF) recently, I would refresh the content to include:

• Recommendation to use PROOF, then sprocket, then cromwell in that order
• Note that you need to create a config file to use sprocket or cromwell
• Note that we do not reccommend installing sprocket or cromwell yourself, you should use the modules
• A simple sprocket config file that they can copy/paste (it's about 4 lines long)
• A code snippet showing an example of running a WDL with sprocket (module load, have command point to config file, etc.)
• Links to writing and submitting an sbatch
• Links to the cromwell stuff if they really want to go that route

@ GitHub username of the listed primary reviewer of the page if known