Add page that lists papers that reference PlasmaPy

[namurphy]

Whilst working on an NSF proposal, I put together a list of papers that reference PlasmaPy in some way. This PR is to add that list to the website.

To get this list, I did a fulltext search on NASA ADS for PlasmaPy, and filtered out records in the PlasmaPy Community on Zenodo, conference abstracts, and a few other records here and there. I then did a search on Google Scholar for "PlasmaPy"...though I had to wade through a bunch of records for "plasma pyrolysis" and "plasma PY" levels which maybe refers to vitamin B6 (pyridoxine) levels in blood? No clue.

• Add this page to the table of contents somewhere so that it shows up on the page
• Double check these references to make sure that they actually are using PlasmaPy.
• Add list of conference abstracts that reference PlasmaPy?
• Include a public link to my ADS private library that includes these search results.
• Add a section to README.md that discusses how to add references to this list.
• Update words to ignore for spell checkers in pre-commit

A big thank you to everyone who cited PlasmaPy in their works! It really does help!

Closes #116. Related to PlasmaPy/PlasmaPy#1753.

Tip

When exporting the list from NASA ADS, I used the following custom format so that it gets lists of

 - %o (%Y). [%T](https://doi.org/%d), %J, %V, %p, doi: %d

[namurphy]

Looking back at the discussion in #116, I'm wondering if it would be better to put these lists in PlasmaPy's documentation itself, rather than on the PlasmaPy project webpage. We could potentially create a bibtex file, and use sphinxcontrib-bibtex to generate a separate bibliography page that focuses solely on papers that have used PlasmaPy to get results.