Get the full integration working for real

Rename `handle_alias` to `write_alias` and implement the function. This
function integrates all our steps together and writes our new alias if
we have one.

Alter our `main` function to remove some of the old code. Don't convert
STDIN to a vector. That was naïve. Instead iterate over its lines
directly. Handle all our errors with either a "no news is good news" or
a panic.

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