* add initial math block Needs, styling mainly! and some logic for how we show empty blocks, etc * add @types/katex * light styling to the math block * add code block * added some styles to code blocks * make cursor handling and themes work * support copying and pasting code blocks * simplify focusBlock for math/code * some styling * add ``` for code blocks * handle copy/paste for math blocks too * handle pasting markdown code blocks * support rendering to published post --------- Co-authored-by: celine <celine@hyperlink.academy>