fix(dotfiles): allow clearing aliases, disable import (#1995)

* fix(dotfiles): allow clearing aliases, disable import

At the moment there are far too many edge cases to handle importing
aliases.

1. We need an interactive shell to print aliases. Without it, most
   shells won't report much.
2. Many people have their shells print things on startup (graphics,
   fortunes, etc). This could be detected as an attempt to set an alias.

 Rather than spend the next year finding import edge cases, I'm
 disabling it for now. There's probably a better way we can do this?

* clippy

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