Render Markdown Codeblocks that contain code

[RomneyDa]

Description

Fixes markdown codeblock rendering when they contain code

Approach

Detect the beginning of markdown code blocks and replace their ```s with ~~~s

People will be copying the code block with no backticks in the vast majority of cases anyways, not the entire generated output

Notes

Benchmarked at sub-millisecond or around 1ms for longer outputs

Doesn't work if language isn't specified in codeblocks, but usually it is
Doesn't work if tildes or more than 3 backticks are used in top-level markdown block, which is an extreme edge case

I wrote a version that does achieve that and included commented out, didn't use for performance/complexity concerns. It essentially predicts if it's another start/end codeblock based on if there's a new line after the ticks or not, but it doesn't work well mid-generation

Checklist

• The relevant docs, if any, have been updated or created

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