Tidying up for future changes

- Changelog started. Existing version 0.0.2
- Add section for application wide TODOs. Each moved to changelog when done
- Adjusted .gitignore and .dockerignore
- Updated image base to python:3.10-slim-trixie. Cleaned up image build.
- Added default environment values to compose file
- Cleaned up pyproject.toml.
- Deleted unused gui-tk.py.

.dockerignore

@@ -2,6 +2,7 @@
 .credentials
 .secrets
 auth.yaml
+config.yaml
 *._py_
 
 # Editors (Editor-specific config files)
@@ -124,3 +125,11 @@ dmypy.json
 .pyre/
 .pytype/
 cython_debug/
+
+design_documents/
+distro_client/subdomain_client.tar.gz
+distro_client/
+config/config.yaml
+config/
+scripts/
+template_vars.env