Remove file logging

This hasn't proven to be as useful as i had hoped:
- My arcane logic for determining logging categories is apparently broken
- It won't work with the logging by the new crypto sdk
- I never actually ended up looking at my own logs, or anyone else's
- It seems to cause crashes

src/app/CMakeLists.txt

@@ -20,8 +20,6 @@ add_library(neochat STATIC
     windowcontroller.h
     models/serverlistmodel.cpp
     models/serverlistmodel.h
-    logger.cpp
-    logger.h
     models/notificationsmodel.cpp
     models/notificationsmodel.h
     proxycontroller.cpp