Display feed icon in articles

[sedrubal]

• I have read the CONTRIBUTING.md and followed the provided tips

Explain the Problem

When reading news on the website (e.g. "unread articles") it's hard to see to which feed a article belongs to. There is only the feed title written in light grey below the article title.
I think it would be better to display the icon of the feed next to the feed title.

System Information

• News app version: 9.0.4
• ownCloud version: 9.1.2

Current:

Better: