chore: migrate manifest to Poetry

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools", "wheel"]
-build-backend = "setuptools.build_meta"
+requires = ["poetry-core>=2.0.0"]
+build-backend = "poetry.core.masonry.api"
 
 [project]
 name = "jcloud-docsgen"
@@ -9,8 +9,7 @@ description = "A tool that generates Markdown documentation for software project
 dependencies = ["docstring-parser"]
 license = "Apache-2.0"
 
-[tool.setuptools]
-package-dir = {"" = "src"}
-
-[tool.setuptools.packages.find]
-where = ["src"]
+[tool.poetry]
+packages = [
+    { include = "jcloud_docsgen", from = "src"}
+]