Docs: recover "Edit on GitHub" links (#11681)

Author: humitos

docs/conf.py

@@ -173,6 +173,10 @@
     # TODO: remove once we support different rtd config
     # files per project.
     "conf_py_path": f"/docs/{docset}/",
+    "display_github": True,
+    "github_user": "readthedocs",
+    "github_repo": "readthedocs.org",
+    "github_version": "main",
     # Use to generate the Plausible "data-domain" attribute from the template
     "plausible_domain": f"{os.environ.get('READTHEDOCS_PROJECT')}.readthedocs.io",
 }