docs: Move the code of conduct under the contributing section.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/docs/index.rst b/docs/index.rst
index b0ea862..23d40fc 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,13 +3,12 @@
 .. toctree::
     :hidden:
 
-    contributing
-    code-of-conduct
-
     Current Status <status>
     known_issues
     versioning
 
+    contributing
+
 
 Welcome to SkyWater SKY130 PDK's documentation!
 ===============================================