Fix spelling

[sjspielman]

Closes #987

This PR fixes typos:

• I added words to dictionary
• I fixed a bad "neighborhood" spelling in hello-clusters and re-rendered the notebook
• I added lots of things in ewings/references/README.md into backticks to not throw a spelling error
  • While I was modifying this file, I noticed a line at the end that didn't seem like it was meant to be there but might have been left over from copy/pasting when creating this bullet list? It's a line that just contains text (without a bullet point) GO:BP ECM Organization. I deleted the line, but let me know if it was supposed to be a bullet in its own right or should be something else altogether?
• I also took this opportunity to update the issue template for monthly spellchecks; after writing the template, we decided not to run the action to confirm spelling errors were fixed, so I removed that essentially "deprecated" bullet

[sjspielman]

I canceled the ewings job - no need to spend cycles for this module here when only a README was modified.

[allyhawkins]

LGTM