Update README and pyproject.toml for Gitea package registry installation and publishing instructions

README.md

@@ -43,6 +43,35 @@ PYTHONPATH=/path/to/python-helpers python3 -m python_helpers.cli.token_decoder -
 The module path replaces the installed command's short hyphenated name; the underlying `main()`
 and behavior are identical.
 
+### Install from the Gitea package registry
+
+```bash
+pip install --index-url https://<username>:<token>@<gitea-host>/api/packages/<owner>/pypi/simple python-helpers
+```
+
+## Publishing
+
+Add the registry to `~/.pypirc`:
+
+```
+[distutils]
+index-servers = gitea
+
+[gitea]
+repository = https://<gitea-host>/api/packages/<owner>/pypi
+username = <username>
+password = <token>
+```
+
+```bash
+pip install build twine
+python3 -m build
+python3 -m twine upload --repository gitea dist/*
+```
+
+> **Note**: a name and version already in the registry cannot be republished. Raise `version`
+> in `pyproject.toml` before each upload.
+
 ## Library
 
 - `console`: colored console output and the `fail()` helper used to report errors and exit