Update and organize documentation

docs/developer/README.md

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+# Development
+========================
+
+If you're new to Django, see [Getting Started with Django](https://www.djangoproject.com/start/) for an introduction to the framework.
+
+## Local Setup
+
+* Install Docker <https://docs.docker.com/get-docker/>
+* Initialize the application:
+
+  ```shell
+  cd src
+  docker-compose build
+  ```
+* Run the server: `docker-compose up`
+
+  Press Ctrl-c when you'd like to exit or pass `-d` to run in detached mode.
+
+Visit the running application at [http://localhost:8080](http://localhost:8080).
+
+## Setting Vars
+
+Every environment variable for local development is set in [src/docker-compose.yml](../../src/docker-compose.yml).
+
+Including variables which would be secrets and set via a different mechanism elsewhere.
+
+## Viewing Logs
+
+If you run via `docker-compose up`, you'll see the logs in your terminal.
+
+If you run via `docker-compose up -d`, you can get logs with `docker-compose logs -f`.
+
+You can change the logging verbosity, if needed. Do a web search for "django log level".
+
+## Running tests
+
+tbd.