[#1528 ] Remove mentions and uses of unless

[jiegillet]

Closes #1528

It's a bit unfortunate that some links (like https://hexdocs.pm/elixir/case-cond-and-if.html#if-unless) mention unless in the hash, but it'll be a quick fix. We could also wait for 1.18 before merging this.

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[jiegillet]

The Elixir School links was broken

[angelikatyborska]

I'm fine with either merging it right now and then creating a new ticket to update the hash locations in the docs to the new ones without unless (looks like it will be https://hexdocs.pm/elixir/main/case-cond-and-if.html#if). Or just keep this PR open until 1.18 is released and update the links before merging. Whichever you prefer 🙂

[jiegillet]

I think we can merge it, I can write an update on the ticket open and keep it open.
It's probably the same amount of work to do the change on main than on this branch. Plus, if we keep even one person from looking up unless, it's worth it :)