Autosummary template for methods broken?

AFAICT, the autosummary templates in https://github.com/ansys/ansys-sphinx-theme/tree/main/src/ansys_sphinx_theme/_templates/autosummary are not used when building a documentation with `ansys-sphinx-theme`.

For example, [this branch](https://github.com/greschd/ansys-sphinx-theme/tree/junk/test_method_doc) adds a `Complex.method`, which should be documented by the `autosummary` directive in the docs here: https://github.com/ansys/ansys-sphinx-theme/blob/main/doc/source/class_documentation.rst#autosummary-directive

The result is that the `method` shows up in the overview of `Complex`, but is not clickable (i.e., its full documentation does not exist).

This can be fixed by copying the `src/ansys_sphinx_theme/_templates/autosummary` to `doc/_templates/autosummary`, but that shouldn't be necessary.

Start by comparing src/ansys_sphinx_theme/_templates/autosummary with the documentation build configuration under doc, then reproduce the Complex.method example from the linked branch and class_documentation.rst. The work is done when the packaged autosummary templates are used without copying them into doc/_templates and Complex.method has clickable full documentation.

Written by the indexing model from the issue text.