Delete .readthedocs.yaml.old

docs/.readthedocs.yaml.old

-# .readthedocs.yaml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Set the version of Python and other tools you might need
-build:
-  os: ubuntu-22.04
-  tools:
-    python: "3.11"
-    # You can also specify other tool versions:
-    #urllib3: "1.26.15"
-    # rust: "1.64"
-    # golang: "1.19"
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-   configuration: docs/conf.py
-python:
-  version: "3.11"
-  install:
-  - requirements:
-      docs/requirements.txt