refs #9 update conf.py for theme and github link

Author: takanory

source/conf.py

@@ -52,7 +52,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = "alabaster"
+html_theme = "sphinx_rtd_theme"
 
 # 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,
@@ -63,3 +63,10 @@
     ".rst": "restructuredtext",
     ".md": "markdown",
 }
+
+html_context = {
+  'display_github': True,
+  'github_user': 'python-ed-open-doc',
+  'github_repo': 'python-starter-guide',
+  'github_version': 'main/source/',
+}