feat: Handle resource copying to avoid conversion

ISO-TC211/standards-isotc211.github.io#3

lib/jekyll-theme-isotc211-helpers.rb

@@ -1,4 +1,5 @@
 require 'jekyll-theme-isotc211-helpers/resource_listing'
+require 'jekyll-theme-isotc211-helpers/resource_copy'
 
 
 module Jekyll

lib/jekyll-theme-isotc211-helpers/resource_copy.rb

@@ -0,0 +1,13 @@
+# Copies resource contents as is to site destination, bypassing Jekyll’s conversion
+
+Jekyll::Hooks.register :site, :post_write do |site|
+  if site.config.key?('resource_listings')
+    site.config['resource_listings'].each do |listing_id, cfg|
+      copy_resource_contents(cfg, site.config['destination'])
+    end
+  end
+end
+
+def copy_resource_contents(resource_cfg, site_dest)
+  FileUtils.cp_r("#{resource_cfg['resource_root']}/.", "#{site_dest}/#{resource_cfg['index_url']}")
+end