I finally figured out why I was getting the wrong indentation, turns out
it was an issue in `lsp-format.nvim`. With that fixed/worked around, I
can now rely completely on `bash-language-server` for formatting.
I'll also rely on `shfmt` automatically detecting the type of file, as
(Neo)Vim cannot be made to reliably set `ft=bash` for Bash scripts and
`ft=sh` for POSIX shell.
Finally, I removed spaces after redirections, I've now come around to
liking the default (no spaces) better.