Bring in nextflow files from 2023-rehgt-nextflow

[taylorreiter]

...which will be archived once this is merged (or deleted...the history isn't that rich)

All tests are passing on the test data set locally.

I chose to skip the following files:

• README.md & CITATIONS.md (they will be a part of a documentation PR later)
• LICENSE (same as the one already in the repo, MIT)
• template.png (picture of the template, not necessary)
• envs/ (already in the repo)
• github/ISSUE_TEMPLATE.md and github/PULL_REQUEST_TEMPLATE.MD (these felt unnecessary)

I also removed all references to 2023-rehgt-nextflow and updated it to 2023-rehgt and made scripts executables so they'll actually run. Lastly, there was a missed script in #13, so I added that.

Everything was already reviewed over at 2023-rehgt-nextflow, so the review should focus on whether I should add the files I chose to omit, or any other high level issues you identify here.

See #17 for upcoming PRs.

[taylorreiter]

For the README, I'd make sure to include a word or two about our deployment on Tower with wave.

~ok! do you mind if I put this in an issue for now and address it during my documentation PR?~

See #30