Added more custom source attributes to output template (#172)

lib/pinchflat_web/controllers/media_profiles/media_profile_html.ex

@@ -59,6 +59,9 @@ defmodule PinchflatWeb.MediaProfiles.MediaProfileHTML do
       upload_year: nil,
       upload_yyyy_mm_dd: "the upload date in the format YYYY-MM-DD",
       source_custom_name: "the name of the sources that use this profile",
+      source_collection_id: "the YouTube ID of the sources that use this profile",
+      source_collection_name:
+        "the YouTube name of the sources that use this profile (often the same as source_custom_name)",
       source_collection_type: "the collection type of the sources using this profile. Either 'channel' or 'playlist'",
       artist_name: "the name of the artist with fallbacks to other uploader fields"
     }