Remove setup.py.

The setup.py will not be needed anymore since maturin will be used to
build python packages.

Maturin requires only the cargo.toml configuration file.

setup.py

@@ -1,27 +0,0 @@
-from setuptools import setup
-from os import path
-
-try:
-    from setuptools_rust import Binding, RustExtension
-except ImportError:
-    print("Please install setuptools-rust package")
-    raise SystemExit(1)
-
-this_directory = path.abspath(path.dirname(__file__))
-with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
-    long_description = f.read()
-
-
-setup(
-    name="tantivy",
-    version="0.10.1",
-    rust_extensions=[RustExtension("tantivy.tantivy", binding=Binding.PyO3)],
-    packages=["tantivy"],
-    description=("Python bindings for the Tantivy full-text search engine "
-                 "library"),
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    license="MIT",
-
-    zip_safe=False,
-)