Merge pull request planetlabs#115 from planetlabs/dockerhub-114

update readmes to link to image in dockerhub

Author: sarasafavi

README.md

@@ -59,9 +59,18 @@ configure. To ease this complexity we provide a docker container for running the
 systems. To install docker on your system please see docker's [documentation](https://docs.docker.com/engine/installation/)
 for your operating system.
 
+### Download prebuilt Docker image (recommended)
+The Docker image for these notebooks is hosted in the [planetlabs/notebooks](https://hub.docker.com/r/planetlabs/notebooks)
+repo on DockerHub. To download and prepare the image for use, run:
+```bash
+docker pull planetlabs/notebooks
+docker tag planetlabs/notebooks planet-notebooks
+```
+
 ### Build the Docker image
-First you must build the docker image. Note, this only has to be done the first time you use it. After checking out the
-this repository, you run:
+Alternatively, you can build the docker image locally. Note, this only has to be done the first time you use it.
+After checking out this repository, you run:
+
 ```bash
 cd planet-notebook-docker
 docker build --rm -t planet-notebooks .

planet-notebook-docker/README.md

@@ -1,6 +1,6 @@
 # Planet Notebook
 
-This image provides the dependencies for running jupyter notebooks in the [planetlabs/notebooks](https://github.com/planetlabs/notebooks) repository. The specifics of building and running this image are given in that repository's [README.md](https://github.com/planetlabs/notebooks/blob/master/README.md) file.
+This image provides the dependencies for running jupyter notebooks in the [planetlabs/notebooks](https://github.com/planetlabs/notebooks) GitHub repository. A prebuilt version of this image can be downloaded from the [planetlabs/notebook](https://hub.docker.com/r/planetlabs/notebooks) dockerhub repo (recommended). Alternatively, this image can be built locally from the Dockerfile. The specifics of building and running this image are given in the planetlabs/notebooks GitHub [README.md](https://github.com/planetlabs/notebooks/blob/master/README.md) file.
 
 This image is based on the [jupyter/minimal-notebook](https://hub.docker.com/r/jupyter/minimal-notebook/) image and additional tips on running the jupyter notebook can be found in the documentation for that image.