Change the default Mathjax mode to SVG

SVG support in mathjax is far better than CSS tricks that depends on browser integration. In https://gitlab.com/frederic-zinelli/pyodide-mkdocs-theme/-/blob/main/pyodide_mkdocs_theme/templates/js-libs/mathjax-libs.js#L42 you should just add output/svg.

Thanks.

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