Useless use of cat

[krader1961]

FYI, while responding to elves/elvish#1416 I noticed that alias.org has two lines of this form:

var content = (cat $file | slurp)

There isn't any need for cat and a pipeline, just do var content = (slurp < $file). I know your alias module is probably no longer being actively maintained now that Elvish has edit:add-var but you should still probably review all your Elvish code for useless uses of cat. 😺