Edit on GitHub (#514)

sphinx/source/conf.py

@@ -177,3 +177,11 @@ todo_include_todos = True
 # Setup the breathe extension
 breathe_projects = {"CCF": "../../doxygen/xml"}
 breathe_default_project = "CCF"
+
+html_context = {
+    'source_url_prefix': "https://github.com/Microsoft/CCF",
+    "display_github": True,
+    "github_user": "Microsoft",
+    "github_repo": 'CCF',
+    "github_version": "master/sphinx/source/",
+}