cziscience landing page (#1347)

* fix dead link in launch page

* first cut at landing page

* wording changes

* add additional refinements

* fixes from PR review

docs/_config.yml

@@ -5,27 +5,29 @@ baseurl: "/cellxgene"
 logo: cellxgene-logo.png
 
 nav:
-- title: Installation
-  url: posts/install
-- title: Gallery
-  url: posts/gallery
-- title: Demo datasets
-  url: posts/demo-data
-- title: Preparing your data
-  url: posts/prepare
-- title: Launching cellxgene
-  url: posts/launch
-- title: Hosting cellxgene
-  url: posts/hosted
-- title: Annotating data
-  url: posts/annotations
-- title: Methods
-  url: posts/methods
-- title: Troubleshooting
-  url: posts/troubleshooting
-- title: Roadmap
-  url: posts/roadmap
-- title: Contributing (ideas or code)
-  url: posts/contribute
-- title: Contact & finding help
-  url: posts/contact
+  - title: Installation
+    url: posts/install
+  - title: Gallery
+    url: posts/gallery
+  - title: Demo datasets
+    url: posts/demo-data
+  - title: Preparing your data
+    url: posts/prepare
+  - title: Launching cellxgene
+    url: posts/launch
+  - title: Hosting cellxgene
+    url: posts/hosted
+  - title: Annotating data
+    url: posts/annotations
+  - title: Methods
+    url: posts/methods
+  - title: Troubleshooting
+    url: posts/troubleshooting
+  - title: Roadmap
+    url: posts/roadmap
+  - title: Contributing (ideas or code)
+    url: posts/contribute
+  - title: Contact & finding help
+    url: posts/contact
+  - title: cellxgene.cziscience.com
+    url: posts/cellxgene_cziscience_com