Update .readthedocs.yaml for pyproject.toml build system (#123)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Nikratio <701625+Nikratio@users.noreply.github.com>

Author: Copilot

.readthedocs.yaml

@@ -7,13 +7,6 @@ build:
     os: ubuntu-22.04
     tools:
         python: "3.11"
-    jobs:
-        post_checkout:
-            - git fetch --unshallow
-        pre_install:
-            - pip install -r requirements.d/rtd.txt
-            - python setup.py build_cython
-            - python setup.py build_ext --inplace
     apt_packages:
         - build-essential
         - pkg-config