/usr/share/jupyter_sphinx_theme/jupyter/sidebartoc.html is in jupyter-sphinx-theme-common 0.0.6+ds1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | {{ toctree(maxdepth=theme_globaltoc_depth|toint, collapse=False, includehidden=theme_globaltoc_includehidden|tobool) }}
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