update conf.py for new version (#255)

conf.py

@@ -33,7 +33,7 @@
 
 # If your documentation needs a minimal Sphinx version, state it here.
 #
-needs_sphinx = '4.4'
+needs_sphinx = '6.2'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -71,15 +71,15 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = [u'_build', u'Thumbs.db', u'.DS_Store']
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = None
+pygments_style = 'sphinx'
 
 
 # -- Options for HTML output -------------------------------------------------