DOC: added button to edit on GitHub

fixes #39859

Author: Sivayogeith

doc/source/conf.py

@@ -270,6 +270,8 @@
             "icon": "fa-brands fa-mastodon",
         },
     ],
+    "secondary_sidebar_items": ["page-toc", "sourcelink", "edit-this-page"],
+    "use_edit_page_button": True
 }
 
 # Add any paths that contain custom themes here, relative to this directory.
@@ -393,6 +395,10 @@
 html_context = {
     "redirects": dict(moved_api_pages),
     "header": header,
+    "github_user": "pandas-dev",
+    "github_repo": "pandas",
+    "github_version": "main",
+    "doc_path": "doc/source",
 }
 
 # If false, no module index is generated.