Switched from "run-tests.sh" script to package manager scripts

scripts/test_docs.py

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2025 I-Form Advanced Manufacturing Research Centre.
+#
+# invenio-config-iform is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+"""A script for testing sphinx documentation building."""
+
+from sphinx.cmd.build import main as build_docs
+
+
+def main() -> None:
+    """Attempt to build documentation."""
+    build_docs(["-nN", "docs", "docs/_build/html"])
+    build_docs(["-nN", "-b", "doctest", "docs", "docs/_build/doctest"])