Place newsroom resources into a single row on homepage

Place all newsroom resources into a single row and remove resource type labels for https://eclipse.org/research.

From: #64 (comment 1012002)

@oliviergoulet can we keep all the resources in a single row? They don't fit the subsections as well for the research page, so I'd rather keep the type labels hidden.

/cc @sgiacomoni2as