Apply suggestions from code review

Co-authored-by: Kabilar Gunalan <[email protected]>
Co-authored-by: Yaroslav Halchenko <[email protected]>

Author: 3 people

docs/50_hub.md

@@ -21,23 +21,18 @@ A "Base (MATLAB)" server is also available, which provides a MATLAB cloud instal
 
 ## 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.
+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 following the instructions below 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.
 
-See https://github.com/dandi/dandi-hub/pull/233 as an example of the changes you need.
-
-
-The following command will build and run a new image, which can be viewed locally in the browser at 127.0.0.1:8888/
 
+1. Fork and clone the [dandi-hub](https://github.com/dandi/dandi-hub) repository.
+2. Add a Dockerfile to the [images](https://github.com/dandi/dandi-hub/tree/main/images) directory.
+3. Test the Dockerfile with the following commands to build and run the new image, which can be viewed locally in the browser at 127.0.0.1:8888/
 ```sh
-docker build -f $(CONTAINERFILE) -t dandihub-dev:latest .
+docker build -f "$(CONTAINERFILE)" -t dandihub-dev:latest .
 docker run --rm -p 8888:8888 --name dev_jupyterlab dandihub-dev:latest start-notebook.sh --NotebookApp.token=""
 ```
-
-To add the new image to the test CI, and to the Dandi Archive Dockerhub, add it to the `include`
-matrix of both `.github/workflows/docker-push.yaml` and `.github/workflows/docker-test.yaml`.
-
-You can add the image to server options by adding options to `envs/shared/jupyterhub.yaml`
-
+4. Add the Dockerfile to the `include` matrix of both the [docker-push.yaml](https://github.com/dandi/dandi-hub/blob/main/.github/workflows/docker-push.yaml) and [docker-test.yaml](https://github.com/dandi/dandi-hub/blob/main/.github/workflows/docker-test.yaml) files.  This will allow the image to be built when new pull requests are opened and pushed to the [DANDI Archive Docker Hub](https://hub.docker.com/u/dandiarchive) when the pull requests are merged. 
+5. Add the image to the server options by updating the [jupyterhub.yaml](https://github.com/dandi/dandi-hub/blob/main/envs/shared/jupyterhub.yaml) file.
 
 ## Example notebooks