Overhaul the whole documentation site

docs/posts/gallery.md

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+---
+title: Gallery
+subtitle: Features & examples
+layout: default
+---
+
+# Features
+
+### Flexible selections, coloring, and differential expression of your selected sets of cells
+<img src="../images/diffexp.gif" width="600"/>
+
+### Single-gene analyses (e.g. expression analysis)
+<img src="../images/customGene.gif" width="600" />
+
+# Interactive demos  
+
+Several groups have independently [deployed](hosted) various versions of cellxgene to the web.
+Check out the cool data that our users are using cellxgene to explore!
+
+### [Kidney cell atlas](https://www.kidneycellatlas.org/)  
+### [Tabula muris senis](https://tabula-muris-senis.ds.czbiohub.org/)  
+### [Hemocytes](https://hemocytes.cellgeni.sanger.ac.uk/)
+### [Melanoma](https://melanoma.cellgeni.sanger.ac.uk/)
+
+_Want us to link to your dataset here? [Just send us a note!](contact)_