Copy-pasting errors from DrRacket to Github, Discord etc.

[soegaard]

Consider this error:

If I copy-paste this error into Github I get:

Welcome to DrRacket, version 8.17 [cs].
Language: racket, with debugging [custom]; memory limit: 2048 MB.
. . /: division by zero

Notice that the stack-trace and the error icons are replaced with ..

In these unicode times, I think, we can find better replacements that a simple dot.

Here are some suggestions for the error icon (courtesy ChatGPT):

It is more difficult to find a stack trace icon. But perhaps:

[rfindler]

The stop sign seems like a fit so I pushed something on a branch. Happy for it to be adjusted!