Also enable (correct) epub MWE

book/tex4ebook.cfg

@@ -1,45 +1,4 @@
 \Preamble{xhtml}
-\renewcommand\listofflowcharts{%
-\chapter*{\listoflocname}%
-\TableOfContents[loc]%
-}
-\ConfigureToc{loc}{\HCode{<span class="lofToc">}}{\ }{}{\HCode{</span><br />}}
 \begin{document}
-\Configure{DocumentLanguage}{en}
-\Configure{OpfScheme}{URI}
-\Configure{UniqueIdentifier}{https://the-bread-code.io}
-\Configure{AddCss}{book-ebook.css}
-\Configure{CoverMimeType}{image/jpeg}
-\CoverMetadata{cover/cover-page.jpg}
-\AddToHook{env/tikzpicture/begin}{\fontfamily{opensans-TLF}\selectfont}
-\Configure{@HEAD}{\HCode{
-<style type="text/css">
-  @import url('https://fonts.cdnfonts.com/css/open-sans');
-  body{
-    font-family: 'Open Sans';
-  }
-</style>}}
-
-% Deal with chemical equations in a single svg
-\ExplSyntaxOn
-\def\standaloneenv#1{}
-\pend:def\schemestart{\Picture+{}}
-\append:def\CF_schemestop{\EndPicture}
-\ExplSyntaxOff
-\makeatletter
-\def\texfourht@tikz@begin{
-  \protect\csname nested:math\endcsname% support display math
-  \Picture+[\csname a:Picture-alt\endcsname]{}%
-}
-\makeatother
-
-% Warnig from Michal: Note that once you get the updated TeX Live with a new
-% `chemfig.4ht` file, you can remove this from the config file:
-%
-%```latex \pend:def\schemestart{\Picture+{}}
-%\append:def\CF_schemestop{\EndPicture} ```
-%
-%You could get an error otherwise, as there would be nested `\Picture+{}` and
-%`\EndPicture` commands.
 
 \EndPreamble