Removes legacy rapids-cmake cython implementations as it is deprecated in 24.08

docs/api.rst

@@ -83,29 +83,6 @@ The ``rapids-cython-core`` module allows projects to easily build cython modules
    /command/rapids_cython_core_create_modules
    /command/rapids_cython_core_add_rpath_entries
 
-.. _`cython_legacy`:
-
-Cython (legacy)
-***************
-
-.. note::
-  ``rapids-cython`` is deprecated. Please switch to ``rapids-cython-core``.
-
-The `rapids_cython` functions allow projects to easily build cython modules using
-`scikit-build <https://scikit-build.readthedocs.io/en/latest/>`_.
-
-.. note::
-  Use of the rapids-cython component of rapids-cmake requires scikit-build. The behavior of the functions provided by
-  this component is undefined if they are invoked outside of a build managed by scikit-build.
-
-.. toctree::
-   :titlesonly:
-
-   /command/rapids_cython_init
-   /command/rapids_cython_create_modules
-   /command/rapids_cython_add_rpath_entries
-
-
 .. _`find`:
 
 Find