category-query tempate part: set the per page value in query-loop to a multiple of 3?

[bobbingwide]

Here we see 10 posts being displayed per page in the Block News category.

• Can we control the number by setting the per_page attribute in the query-loop?
• Do we need both groups - outer className content, inner className article.

[bobbingwide]

Not done yet as far as I can tell