Add plugins link and text

Author: sagikazarmark

_data/navigation.yml

@@ -3,6 +3,10 @@
   url: https://packagist.org/providers/php-http/client-implementation
   external: true
 
+- label: Plugins
+  url: https://github.com/php-http/plugins
+  external: true
+
 - icon: book
   title: Documentation
   url: http://docs.httplug.io

index.html

@@ -54,7 +54,8 @@ <h2>Use your HTTP Client of choice</h2>
             <div class="col-md-8">
                 <h2>Separate logic using plugins</h2>
                 <p class="lead">
-                    We provide adapters for existing HTTP Clients, so you can use whatever client you want.
+                    Need to log each request? Authenticate a request? It's easy. Our powerful plugin system allows you
+                    to add custom logic to the request's lifecycle.
                 </p>
             </div>
         </div>