Move apidoc generation to doc building script

[AVHopp]

This is a small PR, removing an old defensive guard and moving a part of the doc generation to another file to streamline the files a bit.

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[Copilot]

Pull request overview

Moves the sphinx-apidoc API-stub generation out of docs/conf.py and into the documentation build script, aiming to streamline Sphinx config and keep doc-generation steps in one place.

Changes:

• Added _run_apidoc() to docs/scripts/build_documentation.py and invoked it during the docs build flow.
• Removed the legacy in-conf.py apidoc “hack” (including defensive guards and filesystem cleanup).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/scripts/build_documentation.py	Adds a new _run_apidoc() step and calls it as part of the documentation build pipeline.
docs/conf.py	Removes the previous sphinx-apidoc execution block and related imports/guarding logic.

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