* Clarify setup steps for the baby fuzzer
Specifically:
- Explicitly mention that the dependency path must point to a specific
directory in the cloned repo (and not the root directory)
- Explicitly mention how to manually trigger the panic in the harness
for testing purposes
* Clean up documentation on the baby fuzzer
Since the baby fuzzer chapter of the documentation is done in a
"tutorial", step-by-step fashion, it would be nice to be able to see
where exactly new lines have to be placed in the existing code. To that
end, the code used in the tutorial is moved to snippets (as is done in
the Rust Book), as it allows for much more convenient maintenance of the
snippets, as well as easy hiding of the non-important code on any given
snippet.
Furthermore, a few minor fixes are applied; a typo on a comment and a
missing unsafe block.
* Fix code snippet attributes for baby fuzzer
Specifically:
- Remove unnecessary `compile_fail` attribute
- Add `ignore` attribute to the snippets of the complete baby fuzzer. As
explained in [#1290], it is expected for the baby fuzzer to return a
non-0 exit code, so this should not trigger a failure during `mdbook
test`.
* Fix CLI snippet language
For CLI snippets, the "language" should be set to `console`.
* Remove nested safe block in baby_fuzzer listings
