Update trademark and numfocus (#3224)

docs/index.md

@@ -10,6 +10,20 @@ single-cell omics data primarily developed and maintained by the
 
 If you find a model useful for your research, please consider citing the [scvi-tools manuscript](http://dx.doi.org/10.1038/s41587-021-01206-w) as well as the publication describing the model, which can be found in the corresponding documentation.
 
+[//]: # (numfocus-fiscal-sponsor-attribution)
+
+scvi-tools is part of the scverse® project ([website](https://scverse.org), [governance](https://scverse.org/about/roles)) and is fiscally sponsored by [NumFOCUS](https://numfocus.org/).
+If you like scverse® and want to support our mission, please consider making a tax-deductible [donation](https://numfocus.org/donate-to-scverse) to help the project pay for developer time, professional services, travel, workshops, and a variety of other needs.
+
+<div align="center">
+<a href="https://numfocus.org/project/scverse">
+  <img
+    src="https://raw.githubusercontent.com/numfocus/templates/master/images/numfocus-logo.png"
+    width="200"
+  >
+</a>
+</div>
+
 ::::{grid} 1 2 3 3
 :gutter: 2