deprecate capsule

BUR #14301 has been rejected.

deprecate capsule

wiki already says it's ambiguous

Would need to be split into new tags though.

There's a lot of stuff in capsule that I'm not sure how else to tag. I don't like the idea of deprecating something where there's a hundred ambiguous posts that don't fit anywhere else.

The bulk update request #14301 (forum #229984) has been rejected by @nonamethanks.