installation: update to use hatch following change in backend and other frontends: - `setup.py` and `requirements.txt` have been removed in favor of `pyproject.toml` - changed versionning mechanism to use a version directly in `libervia/desktop_kivy/__init__.py` handled by Hatch - remove the log hack from `kivy_hack` as there is now an environment variable to disable the logging hijacking

--- a/libervia/desktop_kivy/__init__.py	Mon Aug 28 17:09:15 2023 +0200
+++ b/libervia/desktop_kivy/__init__.py	Mon Aug 28 18:29:18 2023 +0200
@@ -19,9 +19,7 @@
 import os.path
 
 
-version_file = os.path.join(os.path.dirname(__file__), 'VERSION')
-with open(version_file) as f:
-    __version__ = f.read().strip()
+__version__ = "0.9.0.dev0"
 
 class Global(object):
     @property