Documentation | Handle shell prompts automatically (#139)

[Amar Takhar (@amar)]

Amar Takhar created an issue: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/139

Assignee: Amar Takhar

## Summary

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We have a lot of shell commands.  Traditionally you would want

```shell
$ ls -l
$ find /
```

With the `$` denoting it's a command to write on the shell however now we have `copybutton` installed that lets you copy the text.  It has support to strip prompts out:

* https://sphinx-copybutton.readthedocs.io/en/latest/use.html

I'll open an MR to add

```
copybutton_prompt_text = "$ "
```

The engineer manual will need to be updated to to properly format issues

See also !229 

## Steps to reproduce

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- milestone-->

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