Equation uploads to Wikisource should go into their own category

[Daniel-Mietchen]

Files like the one at
https://en.wikisource.org/w/index.php?title=File:Neurobiological-Models-of-Two-Choice-Decision-Making-Can-Be-Reduced-to-a-One-Dimensional-Nonlinear-pcbi.1000046.e061.jpg&oldid=5068812
have multiple categories assigned to them, none of which are all too helpful.

I thus propose to do away with these article-level keywords entirely for equation images, and to just put them into some maintenance category of the
https://en.wikisource.org/wiki/Category:Equations_uploaded_with_reCitation_Bot
and
https://en.wikisource.org/wiki/Category:Equations_uploaded_with_reCitation_Bot_and_needing_category_review
kind.

Note that the current category names use a different spelling for the bot than the bot's user name suggests.