I was reminded that literally every internet fandom imaginable somehow has a whole wiki dedicated to it, which must involve some standardized process to be easy enough for anyone to do. Turns out yes, they’re all on a dedicated platform with a form to guide you through automatically creating a new wiki. Searching for a handful of common species brings up duplicate pages in multiple different biodiversity-based wikis (e.g. 2 bird wikis, 3 animal wikis… this inactive one might be most promising). This would be free and easy but this platform isn’t really intended for this and would look pretty unprofessional. Nothing on that platform comes across as looking very serious.
On the other hand while searching stuff I did find this database which looks interesting: Library of Identification Resources