feat: ✨ implemented pwa capabillities and refactored lots of backend things

api/router.py

@@ -0,0 +1,8 @@
+from flask import send_from_directory, request
+
+
+def serve_vue_app(app):
+    return send_from_directory(app.static_folder, 'index.html')
+
+def upload_file(request):
+    file = request.files['file']