Detect raw math

[kepano]

• Detect raw LaTeX math delimiters in text nodes when MathJax or KaTeX is configured but hasn't rendered (no JS execution)
• Supports $...$, $$...$$, \(...\), and \[...\] delimiters
• Wraps matched expressions in <math data-latex="..."> elements so the existing math pipeline processes them

Fixes #224

[Azeirah]

Oh wow! I was testing this just last week and found that reMarkable's "send to reMarkable" doesn't render LaTeX. That Mozilla's "render in reading mode" doesn't render LaTeX either. And defuddle didn't work either. That was for my own Obsidian-quartz hosted blog.

Worth rerunning my test then!

Love it! <3