Remove docassemble/__init__.py and update setup.py

[BryceStevenWilley]

All to make sure that our docassemble packages will work with pip / setuptools into the future.

There are few errors that pop up when installing packages on docassemble:

UserWarning: pkg_resources is deprecated as an API. See [https://setuptools.pypa.io/en/latest/pkg_resources.html.](https://setuptools.pypa.io/en/latest/pkg_resources.html.) The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.

The namespace_packages parameter is deprecated.

Please replace its usage with implicit namespaces (PEP 420).

Usage of dash-separated 'description-file' will not be supported in future
versions. Please use the underscore name 'description_file' instead.

How this change was made

Selected repos that already had a docassemble/__init__.py file.

Ran:

gh repo list --limit 450 --json nameWithOwner --source SuffolkLITLab | jq -r '.[] .nameWithOwner' > repos.txt

turbolift foreach -- rm docassemble/__init__.py

Then:

• Manually removed repos where the command failed

Then, using VS Code search-replace:

• replaced find_packages with find_namespace_packages in setup.py.
• Removed the namespace_package=['docassemble'], param in the setup.py.
• description-file to description_file

_{This PR was generated using turbolift.}