Initial Quartz setup for Castle Docs

docs/features/Docker Support.md

@@ -0,0 +1,7 @@
+Quartz comes shipped with a Docker image that will allow you to preview your Quartz locally without installing Node.
+
+You can run the below one-liner to run Quartz in Docker.
+
+```sh
+docker run --rm -itp 8080:8080 -p 3001:3001 -v ./content:/usr/src/app/content $(docker build -q .)
+```