Additionally include our bootstrap code in `brew.sh`, Bash utilities in
`utils.sh` and `utils/*.sh`, `superenv` shims, and the Bash completion.
Closes#654.
Signed-off-by: Martin Afanasjew <martin@afanasjew.de>
Also change the logic a bit to iterate over the individual files per
directory, as having a directory without bash commands will otherwise
pass a literal `*.sh` to `bash -n`, causing it to fail.
ClosesHomebrew/homebrew#48323.
Signed-off-by: Martin Afanasjew <martin@afanasjew.de>