Add standalone Python entrypoint for EasyHAProxy and pip-based installation

- Introduced `/scripts/.venv/bin/easy-haproxy` as the default entrypoint for standalone environments.
- Added `_build_parser` and `start` functions to enable CLI-driven functionality configuration.
- Updated packaging to reflect new `easyhaproxy.main` module and adapted project name from `easymapping` to `easyhaproxy`.
- Modified `Dockerfile` to align with new script paths and entrypoints for better portability.
- Enhanced documentation with dedicated sections for pip-based installation, CLI references, and systemd setup for non-Docker environments.
- Adjusted helm, plugin, and environment-related docs for accurate sidebar ordering.
- Added a new GitHub workflow to automate package publishing to PyPI.

build/Dockerfile

@@ -27,7 +27,7 @@ WORKDIR /scripts
 COPY build/assets /
 
 COPY pyproject.toml uv.lock LICENSE README.md /scripts/
-COPY src/ /scripts/
+COPY src/ /scripts/src/
 COPY tests/ /scripts/tests/
 
 RUN cd /scripts && uv sync --frozen
@@ -36,4 +36,4 @@ RUN apk del .build-deps
 
 RUN cd /scripts && uv run pytest -s -vv tests/ && uv sync --no-dev
 
-CMD ["uv", "run", "python", "-u", "/scripts/main.py"]
+CMD ["/scripts/.venv/bin/easy-haproxy"]