DOC: switch to sphinx_py3doc_enhanced_theme

Author: pavoljuhas

doc/manual/source/conf.py

@@ -124,13 +124,16 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'classic'
+html_theme = 'sphinx_py3doc_enhanced_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-html_theme_options = {'collapsiblesidebar' : 'true'}
+html_theme_options = {
+    'collapsiblesidebar' : 'true',
+    'navigation_with_keys' : 'true',
+}
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
@@ -197,7 +200,7 @@
 # -- intersphinx configuration --------------------------------------------
 
 intersphinx_mapping = {
-    'python' : ('https://docs.python.org/3.6', None),
+    'python' : ('https://docs.python.org/3.7', None),
     'numpy' : ('https://docs.scipy.org/doc/numpy', None),
 }