Registry page: use blocks shortcode and markdown not HTML (#1174)

content/en/registry/_index.md

@@ -5,15 +5,11 @@ menu:
   main: {weight: 20}
 ---
 
-<a class="td-offset-anchor"></a>
-<section class="row td-box td-box--1 position-relative td-box--gradient td-box--height-auto">
-  <div class="container text-center td-arrow-down">
-    <span class="h4 mb-0">
-      <h1>OpenTelemetry Registry</h1>
-      <p>Find libraries, plugins, integrations, and other useful tools for extending OpenTelemetry.</p>
-    </span>
-  </div>
-</section>
+{{% blocks/lead color="primary" %}}
+# {{% param title %}}
+
+Find libraries, plugins, integrations, and other useful tools for extending OpenTelemetry.
+{{% /blocks/lead %}}
 
 {{% blocks/section type="section" color="dark" %}}
 ## What do you need?
@@ -23,9 +19,11 @@ tracer implementations, utilities, and other useful projects in the
 OpenTelemetry ecosystem.
 
 - Not able to find an exporter for your language? Remember, the [OpenTelemetry
-Collector](../docs/collector) supports exporting to a variety of systems
-and works with all OpenTelemetry Core Components!
-- Are you a project maintainer? [Find out how to add your project to the registry
-here](https://github.com/open-telemetry/opentelemetry.io#adding-a-project-to-the-opentelemetry-registry)!
-- Check back regularly, the community and registry is growing!
+  Collector](../docs/collector) supports exporting to a variety of systems and
+  works with all OpenTelemetry Core Components!
+- Are you a project maintainer? See, [Adding a project to
+  the OpenTelemetry Registry][add].
+- Check back regularly, the community and registry are growing!
+
+[add]: https://github.com/open-telemetry/opentelemetry.io#adding-a-project-to-the-opentelemetry-registry
 {{% /blocks/section %}}