TOC rendered from md-files differs from TOC renders from ipynb-files

[jangenoe]

Describe the bug

context
When titles in a jupyter book comprise symbols, the TOC rendered from md-files differs from TOC rendered from ipynb-files

expectation
I expected the TOC to be rendered fully independent of the root format of the file being looked as the main text.

bug
TOC rendered from ipynb-files show the symbols
TOC rendered from md-files show the originating latex

As an example the difference between md and ipynb TOC rendering is shown below.

Markdown

ipynb

Reproduce the bug

1. create a JB with some latex symbols in a title of any chapter
2. provide a md file and a ipynb file in the TOC
3. build the book

List your environment

jupyter-book --version
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          : 0.8.0

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[phockett]

A hacky fix for this issue with TOC maths rendering from .md source, per comment phockett/Quantum-Metrology-with-Photoelectrons-Vol3#4 (comment)

I (eventually) managed to fix the TOC bug, since I realised it only affected pages which had no maths on - in this case it seems like the Mathjax script wasn't automatically injected.

There's likely an elegant way to force this via Sphinx config, but my quick and dirty fix was just to add a cell directly to my Markdown documents duplicating the script tags in the working HTML pages - my patch is in https://github.com/phockett/Quantum-Metrology-with-Photoelectrons-Vol3/blob/main/scripts/mathjax_patch.txt (and my in my main build script I just run cat mathjax_patch.txt >> page.md for each page I need to add the script to).