refactor(clew): use one source file for binary

src/clew/BUILD.bazel

@@ -2,10 +2,7 @@ load("@rules_python//python:defs.bzl", "py_binary")
 
 py_binary(
     name = "clew",
-    srcs = [
-        "__init__.py",
-        "__main__.py",
-    ],
-    main = "__main__.py",
+    srcs = ["clew.py"],
+    main = "clew.py",
     deps = ["//third_party/python:rpycdec"],
 )

src/clew/__init__.py

@@ -1 +0,0 @@
-"""Ren'Py game preparation tool for Ariadne."""