[FR] `console` codeblocks

[chlohal]

On GitHub and many other services, you can use a code-block with the console language to represent a console session. For example:

chlohal@DESKTOP2FA3C:~$ echo 'hi'

It would be a great quality-of-life feature if we could

1. Parse console blocks
2. Recognize command lines (with a $)
3. When running the block, execute the command in the proper directory.

This may have security concerns, but IMO the ease-of-use provided is justifiable. Someone could easily cd in a bash block, but this is easier to write and scans better.