Add image to Turing Way community slide

Author: JimMadge

index.html

@@ -165,6 +165,7 @@ <h2>Contributing to Jupyter Books</h2>
                     </section>
                     <section>
                         <h2>The Turing Way Community</h2>
+                        <img class="r-stretch" alt="A group of people work together on a stage labelled our community. Some are tending to plants with symbols representing data and version control. A new community member is being welcomed to the team. Text emphasises working together, sharing knowledge and helping eachother." src="static/community.svg">
                     </section>
                 </section>
                 <section>