Remove extraneous copyright from bikeshed document (#1030)

document/core/util/bikeshed/conf.py

diff --git a/document/core/util/bikeshed/conf.py b/document/core/util/bikeshed/conf.py
index ebe2841..e38c1a5 100644
--- a/document/core/util/bikeshed/conf.py
+++ b/document/core/util/bikeshed/conf.py
@@ -226,12 +226,12 @@
 
 # If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
 #
-html_show_copyright = True
+html_show_copyright = False
 
 # If this is not None, a ‘Last updated on:’ timestamp is inserted at every
 # page bottom, using the given strftime() format.
 #
-html_last_updated_fmt = '%F'
+html_last_updated_fmt = None
 
 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the