Simplify :gh: ref replacement @ pkg description

Author: webknjaz

packaging/pep517_backend/_transformers.py

@@ -67,11 +67,9 @@ def sanitize_rst_roles(rst_source_text: str) -> str:
     )
 
     gh_role_regex = r"""(?x)
-        :gh:`(?P<gh_slug>[^`]+)(?:\s+(.*))?`
+        :gh:`(?P<gh_slug>[^`<]+)(?:\s+([^`]*))?`
     """
-    gh_substitution_pattern = (
-        r"`GitHub: \g<gh_slug> <https://github.com/\g<gh_slug>>`__"
-    )
+    gh_substitution_pattern = r"GitHub: ``\g<gh_slug>``"
 
     meth_role_regex = r"""(?x)
         (?::py)?:meth:`~?(?P<rendered_text>[^`<]+)(?:\s+([^`]*))?`