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

.gitignore

@@ -38,3 +38,5 @@ nohup.out
 .DS_Store
 *.egg-info
 /wheels/
+client.zip
+*.whl