Add instrumentation script for pageview analytics (#875)

* Add instrumentation script for pageview analytics

* Only include analytics tags in production builds

Wrap hydro-marketing analytics meta tag and script in an
import.meta.env.PROD conditional so they are excluded during
local development and only rendered in production builds.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add production-only analytics tags to Starlight Head component

Add hydro-marketing analytics meta tag and script to the custom
Head.astro component override, gated behind import.meta.env.PROD
so they only render in production builds (GitHub Pages deploy).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mvkaran

website/src/components/Head.astro

@@ -9,3 +9,16 @@ const basePath = import.meta.env.BASE_URL;
     document.body.dataset.basePath = basePath;
   });
 </script>
+{import.meta.env.PROD && (
+  <>
+    <meta
+      name="ha-url"
+      content="https://collector.githubapp.com/awesome-copilot-web/collect"
+    />
+    <script
+      async
+      defer
+      src="https://analytics.githubassets.com/hydro-marketing.min.js"
+    ></script>
+  </>
+)}