Add support for LaTeX rendering to HTML Editor extension

[spacehummer]

Hello TagSpaces team!

After reviewing TagSpaces, I saw that it is possible to use the LaTeX markup language in the Markdown Editor extension, and that's great! But as far as I understand, such a feature is missing for the HTML Editor extension. I would like to suggest adding such a feature to the HTML Editor.

I think that adding such a feature will allow users to more conveniently write and organize information related to mathematics, statistics, physics, etc., while using a format that is easier to transfer to another person. I have already encountered similar features in some WYSIWYG online editors, for example, online editors that are used in forms for submitting an article to the editorial office of a journal.

I did a little research into the possibility of adding this feature to the HTML Editor extension based on the Summernote JavaScript library and found several old repositories on GitHub that already added such a feature to Summernote. It looks like it can be implemented.

It would be very convenient if there was an option to export from the HTML Editor extension to the *.pdf format, as some browsers can. This will allow you to transfer the file to a person without worrying that it will be difficult for him to open it correctly or that some part of the layout will break.

Thank you for considering my suggestion!

Best wishes.