I got markdown working (yay for code blocks)

[krschacht]

I was getting a bit annoyed when I was asking the LLM for some code, it replies with markdown, but the code was not displayed nicely and it was not easy to copy. I just finished implementing full markdown support, most notably for code blocks. I also added a little smartness for easily copying the last code block. Here's a quick demo:

Ensure copying to clipboard includes all markdown

@anandvc @florianfelsing @olimart @robacarp @marckohlbrugge @al3rez @Tabenkin