[WIP] Overhaul the documentation site (#1030)

Overhaul the whole documentation site

docs/_config.yml

@@ -1,11 +1,31 @@
-theme: jekyll-theme-cayman
+theme: jekyll-theme-minimal
 show_downloads: false
-baseurl: /cellxgene
+baseurl: ""
+
+logo: cellxgene-logo.png
 
 nav:
-  - title: Getting Started
-    url: getting-started.html
-  - title: Data
-    url: data.html
-  - title: FAQ
-    url: faq.html
+- 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