symlink config generators to scripts directory at project root.

The generators are currently in the `docker` directory, which isn't the most obvious place if you're running the Grid w/out Docker.

Symlinked because there are generators that are specific to Docker (imgops, nginx, osx_hosts_file) within the generators package, so wouldn't make sense to move the generators directory to project root.

README.md

@@ -102,10 +102,10 @@ cd cloud-formation/scripts
 ./create-dev-stack.sh
 ```
 
-### .properties files
+### Generate .properties files
 
 Generate your .properties files for the various media-service services using the
-[dot-properties generator](./docker/configs/generators/README.md)
+[dot-properties generator](./scripts/config-generators/README.md)
 
 This will also create a ```panda.properties``` file that configures the
 [pan-domain authentication](https://github.com/guardian/pan-domain-authentication)
@@ -256,6 +256,13 @@ From the project root:
 
 you can see the different application names in the Procfile (in project root)
 
+### Running wih Docker
+The Grid can be run within Docker containers!
+
+NB: this has only been tested in DEV.
+
+To do so, follow the [README](./docker/README.md#setup).
+
 ## Troubleshooting
 
 ### Nginx returns "413 Request Entity Too Large"

scripts/config-generators

@@ -0,0 +1 @@
+../docker/configs/generators