fix(dotfiles): allow clearing aliases, disable import

[ellie]

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?

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

[ellie]

No matter what? The intent is for it to allow deleting all aliases to remove Atuin set config

I'm not sure on a use case for only deleting imported aliases - this was prompted by the linked issue but I think it's a good thing to have regardless. I should probably have clarified a bit better in the PR body

[ellie]

Ah I see! No, it doesn't. Run is part of the atuin dotfiles alias command, which contains a pattern match. The pattern match switches based on which subcommand is required, so whether that's alias set, alias clear, etc.