[Feature Request]: Super/Subscript Editor Support

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Feature Description

It would be really nice if the editor supported superscript and subscript tags.

I often write technical posts with mathematical formulas etc., and currently I have to switch to HTML view and manually add _{or ^{tags around e.g. log10(x^2) to make it render the way I want (10 subscripted, ^2 should really be ²).}}

It seems like the editor handles this just fine when I add the tags manually, so I think all that's needed is to add buttons for these tags that work like e.g. the bold/italics buttons.