* exa: add more options
* exa: use `escapeShellArgs`
* exa: don't hardcode executable path in aliases
Prevents aliases from going stale in open terminals when the system is updated.
* exa: use `command` for self-referential alias
Otherwise fish complains about the recursive call.
Drop the aliases from ion shell since it doesn't implement the POSIX
`command` built-in.
* exa: re-add ion aliases
* exa: drop `command`
Fish doesn't complain about recursion if `exa` isn't escaped.
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Co-authored-by: Naïm Favier <n@monade.li>
