pages (blog/view): pagination improvments: - getBlogData renamed to getBlogItems and only returns BlogItems objects, blog_data are not returned anymore as they are already included in the metadata attribute - desired page size can be specified using "page_max" key in request data - better use of RSM data to know if we should set previous or next page URLs - don't display anymore the first page is no items are found, this was confusing and not really making sense