docs: Adding missing CSS file.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/docs/index.rst b/docs/index.rst
index 23d40fc..fc257a5 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,9 +3,9 @@
 .. toctree::
     :hidden:
 
+    versioning
     Current Status <status>
     known_issues
-    versioning
 
     contributing