Add back promo_video_website

Doesn't exist when you search for it, but apparently it does exist.

src/types.nim

@@ -108,6 +108,7 @@ type
     summary = "summary"
     summaryLarge = "summary_large_image"
     promoWebsite = "promo_website"
+    promoVideoWebsite = "promo_video_website"
     promoVideoConvo = "promo_video_convo"
     promoImageConvo = "promo_image_convo"
     promoImageApp = "promo_image_app"