Add installation prompt

Author: JimMadge

index.html

@@ -54,6 +54,15 @@
                 <section>
                     <h1>Build a Jupyter Book with The Turing Way</h1>
                 </section>
+                <section>
+                    <h2>Installing Jupyter Book</h2>
+                    <p><a href="https://next.jupyterbook.org/start/install/">next.jupyterbook.org/start/install</a></p>
+                    <img alt="A QR code linking to the Jupyter Book 2 installation documentation." src="static/jb2_install.svg" width="25%">
+                    <pre><code data-trim>
+                        pip install "jupyter-book>=2.0.0a0"
+                        npm install -g "jupyter-book@>=2.0.0-a0"
+                    </code></pre>
+                </section>
             </div>
         </div>