gp-sphinx: Prevent flash of wrong theme on initial load #428

Job	Run time
qa (3.14)	40s
qa (3.13)	34s
qa (3.12)	30s
qa (3.11)	32s
qa (3.10)	33s
packages	22s
docs	26s
smoke (sphinx-fonts)	13s
smoke (root-install)	12s
smoke (sphinx-autodoc-argparse)	9s
smoke (sphinx-autodoc-docutils)	14s
smoke (gp-sphinx)	13s
smoke (sphinx-gp-theme)	12s
smoke (sphinx-ux-autodoc-layout)	11s
smoke (sphinx-autodoc-pytest-fixtures)	11s
smoke (sphinx-ux-badges)	10s
smoke (sphinx-autodoc-sphinx)	9s
smoke (sphinx-autodoc-api-style)	11s
smoke (sphinx-autodoc-fastmcp)	13s
smoke (sphinx-autodoc-typehints-gp)	21s
	6m 16s

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