pw_docgen: Disable banner due to unicode (Windows)

This disables printing the banner in docgen, since it is currently
breaking the Windows doc build. Eventually this should get re-enabled
once the root issue is addressed.

Bug: pwbug/164
Change-Id: I9cf17edd2f5f83b3da99fc2319fa23fdeea3a45b
diff --git a/pw_docgen/py/docgen.py b/pw_docgen/py/docgen.py
index eed19ec..adf2c75 100644
--- a/pw_docgen/py/docgen.py
+++ b/pw_docgen/py/docgen.py
@@ -130,7 +130,9 @@
     if os.path.exists(args.sphinx_build_dir):
         shutil.rmtree(args.sphinx_build_dir)
 
-    print(SCRIPT_HEADER)
+    # TODO(pwbug/164): Printing the header causes unicode problems on Windows.
+    # Disabled for now; re-enable once the root issue is fixed.
+    #print(SCRIPT_HEADER)
     copy_doc_tree(args)
 
     # Flush all script output before running Sphinx.