refactor the project up to modern standards

pyproject.toml

@@ -0,0 +1,23 @@
+[project]
+name = "forthlift"
+version = "0.1.0"
+description = "A command line application to post sequences of text lines on social media"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "argparse>=1.4.0",
+    "configparser>=7.2.0",
+    "datetime>=6.0",
+]
+
+[project.scripts]
+forthlift = "forthlift.forthlift:main"
+
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+include = ["forthlift*"]
+