Add a "View More News" Link to the Sparkplug home page

Created by: fdesbiens

There is a list of recent news at the bottom of the Sparkplug home page. It displays the three most recent new items. However, the list is lacking a "View More News" button like the one found on iot.eclipse.org.

@chrisguindon I wonder if this is linked to issue #89 (closed).

Thanks for your assistance!