Colour change

Author: dham

doc/source/0_preface.rst

@@ -157,8 +157,8 @@ concepts introduced in that chapter. Terms to be found in a glossary are given
 
     Python has excellent `official online documentation
     <https://docs.python.org/3/>`_, and we link to that throughout the text.
-    External links show up in orange while :ref:`internal links to other parts
-    of the notes <introduction>` are red.
+    External links show up in purple while :ref:`internal links to other parts
+    of the notes <introduction>` are blue.
 
 The text sometimes introduces counterexamples: illustrations of code errors or
 bad implementation ideas. These will be flagged with a big red cross:

doc/source/_themes/finite_element/layout.html

@@ -30,8 +30,6 @@
           <li class="page_item"><a href="{{ pathto('index.html', 1) }}" title="Book">Book</a></li>
           <li class="page_item"><a href="{{ pathto('videos.html', 1) }}" title="Videos">Videos</a></li>
           <li class="page_item"><a href="{{ pathto('exercises.html', 1) }}" title="Exercises">Exercises</a></li>
-
-          <li class="page_item"><a href="https://github.com/object-oriented-python/object-oriented-programming" title="GitHub">GitHub</a></li>
       </ul>
     </div><!-- .menu -->
   </div><!-- #access -->