Updates instructions on running mkdocs locally in docker (#4849)

* updates instructions on running mkdocs locally in docker

Signed-off-by: Paul S. Schweigert <paulschw@us.ibm.com>

* remove whitespace

Signed-off-by: Paul S. Schweigert <paulschw@us.ibm.com>

* style

Signed-off-by: Paul S. Schweigert <paulschw@us.ibm.com>

hack/docker/README.md

@@ -1,29 +1,3 @@
 # Development notes for working with mkdocs
 
-You can use a Docker container and run MkDocs from the container, so no local installation of mkdocs is required:
+For details about how to use a container for local development, see [Use the Docker container](../../contribute-to-docs/getting-started/previewing-docs-locally.md#option-1-use-the-docker-container) on the Previewing Docs Locally page.
-
-- You need to have [Docker](https://www.docker.com) installed and running on your system
-- There are helper configurations installed if you have npm from [Node.JS](https://nodejs.org) installed.
-- Build the development docker container image, this is only need it once if the dependencies have not changed.
-    ```bash
-    npm run dev:build
-    ```
-- To start developing run the following command in the root directory of the git repo (where **package.json** and **mkdocs.yaml** are located)
-    ```bash
-    npm run dev
-    ```
-- Open a browser to http://localhost:8000, where you will see the documentation site.  This will live update as you save changes to the Markdown files in the `docs` directory.
-- To stop developing run the following command in another terminal window, which will terminate the docker container
-    ```bash
-    npm run dev:stop
-    ```
-- To build the static HTML files including both mkdocs and hugo run the following command.
-    ```bash
-    npm test
-    ```
-- To view additional npm scripts run the following command
-    ```bash
-    npm run
-    ```
-
-