Missing kirby implications

BUR #5905 has been approved by @evazion.

create implication kirby_cafe -> kirby_(series)
create implication kirby_fighters_2 -> kirby_(series)

All the other games (as well as the tv series) implicate the series as a whole, so these probably should too. (I missed these in the last BUR)

I really don't like doing implications like this for copyright tags that have literally one post, and probably won't ever get any more posts. The threshold for implying copyright tags is lower than for general tags, but not that low.

The bulk update request #5905 (forum #188864) has been approved by @evazion.

Maybe add an absolute minimum count requirement for implications? Otherwise people are just gonna keep requesting them. Maybe something like 10 posts.