Remove duplicated lint-shell target in Makefile

Closes #67

Author: dannywillems

Makefile

@@ -57,10 +57,6 @@ check: check-format lint typecheck test ## Run all checks
 check-outdated: ## Check for outdated dependencies
 	poetry show --outdated || true
 
-.PHONY: lint-shell
-lint-shell: ## Lint shell scripts using shellcheck
-	shellcheck .github/scripts/*.sh
-
 .PHONY: clean
 clean: ## Clean build artifacts
 	rm -rf dist/ build/ *.egg-info/ .pytest_cache/ .mypy_cache/ .ruff_cache/