Disable copying org-preview image files in ltximg folder when using mathjax for equation rendering.

[panmengguan]

Thanks very much for this awesome package! Since I use mathjax for the equation rendering of exported hugo pages, is it possible to disable copying the org-preview image files in the ltximg folder (org-preview-latex-image-directory) to the static/ltximg folder?

[vherrmann]

I actually think that the copying of the ltximg folder should be disabled by default since this feature could leak information (the latex snippets) that is not part of the blog files .

[panmengguan]

According to the definition of the function org-hugo-body-filter
https://github.com/kaushalmodi/ox-hugo/blame/cb1b6cfd7b080e889352150416c1725f11ba937a/ox-hugo.el#L3746
the default behaviour of ox-hugo is to copy this ltximg folder.