On f6799ab

As the title says, the math sections in HTML output generated by _repr_html_ from StateSpace (and other classes) is not rendered.

This is not really the fault of this library and there is an open issue in the VSCode repo for this, but the simpler output which used _html_latex_ before #1091 did not have this problem.

I think adding back the old _repr_latex_ would allow the user to choose between the new mixed HMTL output and the old Latex output if using VSCode, what do you think?

Another option that I saw in the VSCode issue is to explicitly add the renderer into the HTML but this seems really hacky: