Merge pull request #127 from asmacdo/add-custom-image-doc

Document the possibility of extra dandihub images in the user docs

docs/50_hub.md

@@ -19,11 +19,15 @@ We request that users of this server be considerate of their usage of the DANDI
 Training large deep neural networks is not appropriate.
 A "Base (MATLAB)" server is also available, which provides a MATLAB cloud installation but you would be required to provide your own license.
 
+## Custom server image
+
+If you need additional software installed in the image, you can add a server image that will be made available for all users in the `Server Options` menu.  Add a server image by updating the `profileList` in the [JupyterHub config file](https://github.com/dandi/dandi-hub/blob/do-eks/helm/jupyterhub/dandihub.yaml) and submitting a pull request to the [dandi-hub repository](https://github.com/dandi/dandi-hub).  Once the pull request is merged, the DANDI team will redeploy JupyterHub and the image will be available.
+
 ## Example notebooks
 
 The best way to share analyses on DANDI data is through the DANDI example notebooks.
 These notebooks are maintained in the [dandi/example-notebooks](https://github.com/dandi/example-notebooks) repository which provides more information about their organization.
 Dandiset contributors are encouraged to use these notebooks to demonstrate how to read, analyze, and visualize the data, and how to produce figures from associated scientific publications.
 
 Notebooks can be added and updated through a pull request to the [dandi/example-notebooks](https://github.com/dandi/example-notebooks) repository.
-Once the pull request is merged, your contributed notebook will be available to all DANDI Hub users.
+Once the pull request is merged, your contributed notebook will be available to all DANDI Hub users.