fix: revert back to setup.py + setup.cfg

apparently with python 3.6 things "mostly" work but then they break if
any specified dependencies have a dot in the name.  which in this
project, is the case for `zope.sqlalchemy`

so until we drop python 3.6 support, we cannot use pyproject.toml here

pyproject.toml

@@ -1,101 +0,0 @@
-
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
-
-
-[project]
-name = "Tailbone"
-version = "0.11.0"
-description = "Backoffice Web Application for Rattail"
-readme = "README.rst"
-authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
-license = {text = "GNU GPL v3+"}
-classifiers = [
-        "Development Status :: 4 - Beta",
-        "Environment :: Web Environment",
-        "Framework :: Pyramid",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
-        "Natural Language :: English",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Topic :: Internet :: WWW/HTTP",
-        "Topic :: Office/Business",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-]
-
-dependencies = [
-        "asgiref",
-        "colander",
-        "ColanderAlchemy",
-        "cornice",
-        "cornice-swagger",
-        "deform",
-        "humanize",
-        "Mako",
-        "markdown",
-        "openpyxl",
-        "paginate",
-        "paginate_sqlalchemy",
-        "passlib",
-        "Pillow",
-        "pyramid>=2",
-        "pyramid_beaker",
-        "pyramid_deform",
-        "pyramid_exclog",
-        "pyramid_fanstatic",
-        "pyramid_mako",
-        "pyramid_retry",
-        "pyramid_tm",
-        "rattail[db,bouncer]",
-        "six",
-        "sa-filters",
-        "simplejson",
-        "transaction",
-        "waitress",
-        "WebHelpers2",
-        "zope.sqlalchemy",
-]
-
-
-[project.optional-dependencies]
-docs = ["Sphinx", "sphinx-rtd-theme"]
-tests = ["coverage", "mock", "pytest", "pytest-cov"]
-
-
-[project.entry-points."paste.app_factory"]
-main = "tailbone.app:main"
-webapi = "tailbone.webapi:main"
-
-
-[project.entry-points."rattail.cleaners"]
-beaker = "tailbone.cleanup:BeakerCleaner"
-
-
-[project.entry-points."rattail.config.extensions"]
-tailbone = "tailbone.config:ConfigExtension"
-
-
-[project.urls]
-Homepage = "https://rattailproject.org"
-Repository = "https://kallithea.rattailproject.org/rattail-project/tailbone"
-Issues = "https://redmine.rattailproject.org/projects/tailbone/issues"
-Changelog = "https://kallithea.rattailproject.org/rattail-project/tailbone/files/master/CHANGELOG.md"
-
-
-[tool.commitizen]
-version_provider = "pep621"
-tag_format = "v$version"
-update_changelog_on_bump = true
-
-
-# [tool.hatch.build.targets.wheel]
-# packages = ["corepos"]