refactor: restructure package and fix module import

- Move `github.py` from `src/` to `github_desktop_notifier/`
- Move `github_desktop_notifier.py` from `src/` to `github_desktop_notifier/`
- Update import in `github_desktop_notifier.py` to use relative import
- Delete `src/__main__.py` and ensure `__init__.py` is present in `github_desktop_notifier/`

src/github_desktop_notifier.py → github_desktop_notifier/github_desktop_notifier.py

@@ -5,7 +5,7 @@
 import shutil
 import threading
 
-from github import Github
+from .github import Github
 
 # Constants #
 

setup.py

@@ -0,0 +1,35 @@
+# Imports #
+from setuptools import setup, find_packages
+
+# Setup #
+setup(
+    name="github-desktop-notifier",
+    version="1.0.0",
+    description="Receive instant GitHub notifications on your Linux desktop",
+    url="https://github.com/bytexenon/Github-Desktop-Notifier",
+    author="bytexenon",
+    author_email="ddavi142@asu.edu",
+    license="MIT",
+    classifiers=[
+        "Development Status :: 4 - Beta",
+        "Intended Audience :: Developers",
+        "Topic :: Software Development :: Build Tools",
+        "License :: OSI Approved :: MIT License",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+    ],
+    keywords="github desktop notifier linux notifications dunstify gh",
+    packages=find_packages(exclude=["tests", "docs"]),
+    install_requires=["requests"],
+    entry_points={
+        "console_scripts": [
+            "github-notifier=github_desktop_notifier.github_desktop_notifier:main",
+        ],
+    },
+)