hats article

[Gabor Kovesdan]

Hi Warner,

on doc@ and www@ we are talking about cleaning up old content. Your hats
article came into focus because it seems very short for an article and
imo it is too general and explains things that one should know by common
sense and some of such information is also included in committers-guide.
One alternative suggestion was to move the content to internal/ instead
of simply removing. As the author of the article, we would like to hear
your opinion on this.

Thanks,
Gabor