feat: tag loop-remove

[GriceTurrble]

Details the gotcha of removing items from a collection while iterating that collection inside a for loop.

This should add tags for !loop-remove, !loop-add, and !loop-modify, all pointing to the same embed.

[vivax3794]

I made a gif for this as discussed on discord, you ofc have my full permission to use it. it has a similar quality/fps to the return-gif one (actually slightly bigger).

[mbaruh]

I made a gif for this as discussed on discord, you ofc have my full permission to use it. it has a similar quality/fps to the return-gif one (actually slightly bigger).

That's a really cool GIF. One thing is that I think it's better to show on the right what's being printed, to clarify that the result is "2\n4\n". Currently it looks like it ends too soon before I can understand what you're showing.

[ChrisLovering]

Tag looks great, lets merge this. If we want to add a gif we can do so in a later PR.