Add RSS icon for news

[romangg]

The old website had one according to a forum member. We should provide one again.

[nurRiyad]

Fixed #47

[romangg]

#47 is merged.

We can continue using this image to track adding an icon to the news page with a link to the rss feed.

[romangg]

For icon requirements see #47 (comment).

[nurRiyad]

Fixed #48 @romangg

[nurRiyad]