* Simplify release-checklist.md by printing `-h`, `--help` and `man` in CI
Note that we run `find . -name bat.1` before we run anything with
`--all-features`, because `--all-features` is considered a separate
target, and so we will get a different (but identical) `bat.1`. For
example, we might have these:
./target/debug/build/bat-218e9538b4996215/out/assets/manual/bat.1
./target/debug/build/bat-89d6f56802af023f/out/assets/manual/bat.1
By showing the man page earlier, there is only one `bat.1` to pick from.
* Use plain `man $(find . -name bat.1)`
