Add View More Resources functionality to newsroom resources which use the image template

This issue is a blocker for eclipsefdn/it/websites/eclipse.org-research#64

The resources-images.mustache template should render a "View More Resources" button when the data attribute data-res-view-more is set.

This feature has been implemented for the resources-image-with-title.mustache.

This is a site which currently utilizes this functionality: https://iot.eclipse.org/community/resources/