dark mode not working

[joamatab]

Describe the bug

context
When I enable dark mode
https://joamatab.github.io/gdsfactory

and i go to another tab on the right , the dark mode disappears

expectation
I expect darkmode to stick as it happens with jupyterbook
https://gdsfactory.github.io/gdsfactory/notebooks/_3_vscode.html

Reproduce the bug

build docs on CICD

https://github.com/joamatab/gdsfactory

List your environment

Jupyter Book      : 0.15.1
External ToC      : 0.3.1
MyST-Parser       : 0.18.1
MyST-NB           : 0.17.2
Sphinx Book Theme : 1.0.1
Jupyter-Cache     : 0.6.1
NbClient          : 0.7.4

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[rowanc1]

Duplicate of #319 and #233. Closing this in favour of discussion in #319.