feat: accepted assays docs

Author: MillenniumFalconMechanic

frontend/doc-site/032__Contribute and Publish Data.mdx

@@ -22,6 +22,7 @@ CELLxGENE is focused on supporting the global community attempting to create ref
 - drug screens
 - cell lines
 - organisms other than mouse or human
+- assays not on the [Census accepted assays list](https://github.com/chanzuckerberg/cellxgene-census/blob/main/docs/census_accepted_assays.csv)
 
 ### Scale Constraints