identifier, author & categories

app/views/admin/communication/website/authors/jekyll.html.erb

 ---
+identifier: "<%= @author.id %>"
 first_name: "<%= @author.first_name %>"
 last_name: "<%= @author.last_name %>"
 slug: "<%= @author.slug %>"

app/views/admin/communication/website/posts/jekyll.html.erb

@@ -2,6 +2,11 @@
 title: "<%= @post.title %>"
 date: <%= @post.published_at %> UTC
 slug: "<%= @post.slug %>"
+author: "<%= @post.author_id %>"
+categories:
+  <% @post.categories.each do |category| %>
+  - "<%= category.id %>"
+  <% end %>
 <% if @post.featured_image.attached? %>
 image: "<%= @post.featured_image.blob.id %>"
 <% end %>