Remove delta workarounds (#2952)

* Remove delta workarounds

* make test change

* Revert "make test change"

This reverts commit 225fbce.

source/conf.py

@@ -274,15 +274,6 @@ def setup(app):
     "conf_py_path": "/source/",  # Path in the checkout to the docs root
 }
 
-# Override github_version to commit ID for PRs so Delta extension shows PR changed files
-if os.getenv("READTHEDOCS_VERSION_TYPE") == "external":
-    html_context["github_version"] = os.environ.get("READTHEDOCS_GIT_IDENTIFIER")
-
-# Set commit and current_version, used by delta extension, when on RTD
-if os.getenv("READTHEDOCS") == "True":
-    html_context["commit"] = os.environ.get("READTHEDOCS_GIT_COMMIT_HASH")[:8]
-    html_context["current_version"] = os.environ.get("READTHEDOCS_VERSION_NAME")
-
 # -- Options for latex generation --------------------------------------------
 
 latex_engine = "xelatex"