Is your feature request related to a problem? Please describe.

Currently, whenever copying from a code block, all code exposed in that box will be copied. In an ideal world, within the same code block I am able to show a command as well as the resulting output of a command. However, as a user, when copying the code I only want the actual command without the outputs to be copied.

E.g.

```sh
ls # command

file file file file #output

Describe the solution you'd like

Being able to define a line or range of lines of code to be copied from a code block.

```sh{cp1}
ls # command

file file file file #output

Describe alternatives you've considered

No response

Additional context

No response

Validations

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• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.