Hi alfozaav, what do you mean by "community-level articles"? You want a list of messages from the entire community to display on your group hub? And when you say articles do you mean any style of message or are you looking for specifically TKB articles for example?
You can use a LiQL query of the messages collection to get what you are looking for. This page messages (khoros.com) has all the different fields and constraints you would want.
So, for some examples.
Messages from the entire community:
SELECT subject, author, board, view_href FROM messages
Only TKB articles (depth=0 gets only top level posts no replies or comments):
SELECT subject, author, board, view_href FROM messages WHERE conversation.style='tkb' AND depth=0
With freemarker:
<#assign resp = liql("SELECT subject, author, board, view_href FROM messages WHERE conversation.style='tkb' AND depth=0") />