Use LiveView navigation to go back to the dashboard

Since both the dashboard and the error page are in the same live_session
we can navigate between them using LiveView navigation instead of
triggering a full page reload. This is more efficient as we don't need
to negotiate TLS and fetch assets again.

Author: crbelaus

lib/error_tracker/web/live/show.html.heex

@@ -1,5 +1,7 @@
 <div class="my-6">
-  <.button type="link" href={dashboard_path(@socket, @search)}>« Back to the dashboard</.button>
+  <.link navigate={dashboard_path(@socket, @search)}>
+    <.icon name="arrow-left" /> Back to the dashboard
+  </.link>
 </div>
 
 <div id="header">