[FacebookBridge] Don't remove description of embedded media
[FacebookBridge] Don't remove description of embedded media

FB includes origin information (i.e. "YOUTUBE.COM") as well as
descriptions with embedded media (images and video).

These details are currently being removed by the bridge.

This commit changes implementation to only remove origin information
and keep the media description in place. The media description consists
of two elements - title and description. The title provided by FB is
included in an anchor, which gets replaced by a paragraph with the
same contents to improve readability.

References #912

sebsauvage/rss-bridge,kranack/rss-bridge,Frenzie/rss-bridge,kranack/rss-bridge,kranack/rss-bridge,Frenzie/rss-bridge,simonbru/rss-bridge,Riduidel/rss-bridge,ORelio/rss-bridge,ORelio/rss-bridge,Riduidel/rss-bridge,kranack/rss-bridge,Riduidel/rss-bridge,RSS-Bridge/rss-bridge,RSS-Bridge/rss-bridge,ORelio/rss-bridge,RSS-Bridge/rss-bridge,simonbru/rss-bridge