Add "tool.setuptools.packages.find" as advised by Charalamm at /questions/72294299/multiple-top-level-packages-discovered-in-a-flat-layout

pyproject.toml

@@ -83,5 +83,12 @@ slixfeed = "slixfeed.__main__:main"
 
 [tool.setuptools]
 platforms = ["any"]
+
 [tool.setuptools.package-data]
 "*" = ["*.ini", "*.csv", "*.toml", "*.svg"]
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["slixfeed"]
+exclude = []
+namespaces = false