remove Chinese support

doc/source/conf.py

@@ -59,8 +59,8 @@ html_theme = 'sphinx_rtd_theme'
 html_static_path = ['_static']
 
 # -- Support Chinese -------------------------------------------------------
-latex_engine = 'xelatex'
-latex_use_xindy = False
-latex_elements = {
-    'preamble': '\\usepackage[UTF8]{ctex}\n',
-}
+# latex_engine = 'xelatex'
+# latex_use_xindy = False
+# latex_elements = {
+#     'preamble': '\\usepackage[UTF8]{ctex}\n',
+# }