Add confirmation dialogue when marking task/writeup as spam

[Nissen96]

I just read a task and noticed a button in the top with a fire icon. I was curious what that did and clicked it, but was then told that the content was now marked as spam.

That was definitely not the intention, and there was no way to see that this is what the button did. Please add a popup confirmation dialogue, asking if you are sure you want to mark this as spam to avoid such issues! And potentially make it clearer this is what the button does, a fire icon doesn't mean "mark as spam" to me.

The task was definitely not spam and shouldn't be marked as such: https://ctftime.org/task/17577

Edit: This should be done for both tasks and writeups