Modernized build

* Move to src/ layout
* Use pyproject.toml to configure packaging

Author: ktbarrett

pyproject.toml

@@ -1,7 +1,46 @@
 [build-system]
-requires = ["setuptools >= 61"]
+requires = ["setuptools>=61.2"]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "sphinxcontrib-prettyspecialmethods"
+description = "Shows special methods as the python syntax that invokes them"
+readme = "README.rst"
+authors = [{name = "Thomas Smith"}]
+maintainers = [{name = "Kaleb Barrett", email = "dev.ktbarrett@gmail.com"}]
+license = "MIT"
+license-files = ["LICENSE"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Environment :: Console",
+    "Environment :: Web Environment",
+    "Framework :: Sphinx :: Extension",
+    "Intended Audience :: Developers",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Documentation",
+    "Topic :: Documentation :: Sphinx",
+    "Topic :: Utilities",
+]
+requires-python = ">=3.9"
+dependencies = ["sphinx"]
+dynamic = ["version"]
+
+[project.urls]
+Homepage = "https://github.com/ktbarrett/prettyspecialmethods"
+"Bug Tracker" = "https://github.com/ktbarrett/prettyspecialmethods/issues"
+"Source Code" = "https://github.com/ktbarrett/prettyspecialmethods"
+
+[tool.setuptools.dynamic]
+version = {attr = "sphinxcontrib.prettyspecialmethods.__version__"}
+
 [tool.ruff.lint]
 select = ["E", "W", "F", "I", "UP", "RUF"]
 ignore = [
@@ -15,7 +54,7 @@ required-imports = ["from __future__ import annotations"]
 docstring-code-format = true
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 show_column_numbers = true
 show_error_context = true
 ignore_missing_imports = true