Move source code to src/leek

This makes the package work again

src/leek/leek_app.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import signal
+from PySide6.QtGui import QGuiApplication
+from PySide6.QtCore import QUrl
+from PySide6.QtQml import QQmlApplicationEngine
+
+
+def main():
+    """Initializes and manages the application execution"""
+    app: QGuiApplication = QGuiApplication(sys.argv)
+    app.setDesktopFileName("xyz.toast003.leek")
+    app.setApplicationName("Leek")
+    engine = QQmlApplicationEngine()
+
+    """Needed to close the app with Ctrl+C"""
+    signal.signal(signal.SIGINT, signal.SIG_DFL)
+
+    """Needed to get proper KDE style outside of Plasma"""
+    if not os.environ.get("QT_QUICK_CONTROLS_STYLE"):
+        os.environ["QT_QUICK_CONTROLS_STYLE"] = "org.kde.desktop"
+
+    base_path = os.path.abspath(os.path.dirname(__file__))
+    url = QUrl(f"file://{base_path}/Main.qml")
+    engine.load(url)
+
+    if len(engine.rootObjects()) == 0:
+        quit()
+
+    app.exec()
+
+
+if __name__ == "__main__":
+    main()