Merge branch 'update_cookbook_version' into 'develop'

add 7.1 to available CookBook versions

See merge request orfeotoolbox/otb!692

Documentation/Cookbook/_static/html/versions.html

@@ -11,6 +11,7 @@
             <dd><a href="https://www.orfeo-toolbox.org/CookBook-6.4/">6.4.0</a></dd>
             <dd><a href="https://www.orfeo-toolbox.org/CookBook-6.6.1/">6.6.1</a></dd>
             <dd><a href="https://www.orfeo-toolbox.org/CookBook-7.0/">7.0.0</a></dd>
+            <dd><a href="https://www.orfeo-toolbox.org/CookBook-7.1/">7.1.0</a></dd>
             <dd><a href="https://www.orfeo-toolbox.org/CookBook-develop/">develop</a></dd>
         </dl>
     </div>