Combine local JS.

’yui-compressor’ is no longer used.

assets/js/data/pv-data.js

@@ -0,0 +1,9 @@
+const proxyData = '{"url": "{{ site.google_analytics.pv.proxy_endpoint }}"}';
+
+{%- capture pv_data -%}
+  {%- if site.google_analytics.pv.cache and site.google_analytics.pv.enabled -%}
+    {% include_relative data/_pageviews.json %}
+  {%- endif -%}
+{%- endcapture -%}
+
+const pageviews = '{{ pv_data }}';