refactor Paths and update build workflow

+ rename app_dir -> config_dir and config_dir to config_parent
+ bundle web client as zip
+ bundle and extract client zip when running pyinstaller builds
+ installer pyinstaller as main dependency
+ remove fallback client flag
+ handle already used port
+ add assethandler class
+ remove some startup logs
+ ignore wheels and client.zip files

src/swingmusic/start_info_logger.py

@@ -18,4 +18,4 @@ def log_startup_info(host: str, port: int):
             f"{TCOLOR.OKGREEN}http://{address}:{port}{TCOLOR.ENDC}"
         )
 
-    print(f"\n{TCOLOR.YELLOW}Data folder: {Paths().app_dir}{TCOLOR.ENDC}\n")
+    print(f"\n{TCOLOR.YELLOW}Data folder: {Paths().config_dir}{TCOLOR.ENDC}\n")