Update documentation for theme changes in project_template index.rst

Author: ascholerChemeketa

runestone/common/project_template/_sources/index.rst

@@ -84,16 +84,14 @@ Now feel free to modify this file to start creating your own interactive page.
 Section 4: Theme
 :::::::::::::::::::
 
-You can override the style rules in the default theme by adding css rules to a file named **theme-overrides.css** (the filename is important - this will replace an existing file). Make sure the file's directory is part of the ``html_static_path``. You can do so by placing it in a folder **_static**, then modifying ``html_static_path`` in conf.py to include that folder:
-
-.. code:: 
-
-    html_static_path =  runestone_static_dirs() + ['_static']
+You can add your own CSS or JS files to every page of a book by modifying ``setup.custom_css_files`` or ``setup.custom_js_files`` in conf.py.
 
+If you want to do more significant changes to the theme, you should copy the files you wish to modify from
+the runestone/common/project/template/sphinx_bootstrap to a directory like ``_templates/``. Then make sure
+the ``templates_path`` points to them in your conf.py.
 
-If you want to do more significant changes to the theme, you should copy the files in the runestone/common/project/template/sphinx_bootstrap to a directory like ``_templates/my_theme``. Then make sure these values are set in conf.py:
+conf.py:
 
 .. code:: 
 
-    html_theme_path = ["_templates"]
-    html_theme = 'my_theme'
+    templates_path = ["_templates"]