Update "Example project usage" section

Author: benjaoming

.gitignore

@@ -1,2 +1,2 @@
-docs/conf.py
-docs/_build
+/docs/conf.py
+/docs/_build

README.rst

@@ -28,7 +28,7 @@ This example shows a Jupyter Book project with Read the Docs. You're encouraged
 Example Project usage
 ---------------------
 
-This project has a standard Sphinx layout which is built by Read the Docs almost the same way that you would build it locally (on your own laptop!).
+This project has a standard Jupyter Book layout which is built by Read the Docs almost the same way that you would build it locally (on your own laptop!).
 
 You can build and view this documentation project locally - we recommend that you activate `a local Python virtual environment first <https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment>`_:
 
@@ -37,25 +37,11 @@ You can build and view this documentation project locally - we recommend that yo
     # Install required Python dependencies (Sphinx etc.)
     pip install -r docs/requirements.txt
 
-    # Enter the Sphinx project
-    cd docs/
+    # Run Jupyter Book
+    jupyter-book build docs/
     
-    # Run the raw sphinx-build command
-    sphinx-build -M html . _build/
-
-
-You can also build the documentation locally with ``make``:
-
-.. code-block:: console
-
-    # Enter the Sphinx project
-    cd docs/
-    
-    # Build with make
-    make html
-    
-    # Open with your preferred browser, pointing it to the documentation index page
-    firefox _build/html/index.html
+    # View the docs with for instance firefox
+    firefox docs/_build/index.html
 
 
 Using the example in your own project
@@ -65,11 +51,14 @@ If you are new to Read the Docs, you may want to refer to the `Read the Docs Use
 
 If you are copying this code in order to get started with your documentation, you need to:
 
-#. place your ``docs/`` folder alongside your Python project. If you are starting a new project, you can adapt the `pyproject.toml` example configuration.
 #. use your existing project repository or create a new repository on Github, GitLab, Bitbucket or another host supported by Read the Docs
 #. copy ``.readthedocs.yaml`` and the ``docs/`` folder into your project.
+#. if you don't already have a ``.gitignore``, use the one from the project file -- otherwise add these lines::
+
+    /docs/conf.py
+    /docs/_build
+
 #. customize all the files, replacing example contents.
-#. add your own Python project, replacing the ``pyproject.toml`` configuration and ``lumache.py`` module.
 #. rebuild the documenation locally to see that it works.
 #. *finally*, register your project on Read the Docs, see `Importing Your Documentation <https://docs.readthedocs.io/en/stable/intro/import-guide.html>`_.