Use image attachments in opengraph tags#252

For services such as discord that generate embed previews from urls, it would be great if the first attached image on a feedback item is used in the embed, currently it always shows the nolt logo.

That’s a great idea. Thanks @Foxy

Related #121

@Daniel Stefanovic this card and #121 should probably be merged as I believe they both pertain to opengraph meta tags :)