Use RemoteUrl instead of PreviewUrl and increase API timeout to 60 seconds

internal/web/handlers/embedCard.go

@@ -22,6 +22,6 @@ func (ps *EmbedCardHandler) GetEmbedCard(c *gin.Context) {
 	post := ps.PostService.GetRandomPost()
 	c.HTML(200, "home/embed.html", gin.H{
 		"postUrl":  post.Url,
-		"imageUrl": post.Attachments[0].PreviewUrl,
+		"imageUrl": post.Attachments[0].RemoteUrl,
 	})
 }