enhanced navigation and added coach reassignment

website/js/pages/coaches.js

@@ -1,5 +1,5 @@
 import { apiGet } from '../api.js';
-import { showToast } from '../app.js';
+import { pageHeaderHTML, showToast } from '../app.js';
 
 const FETCH_LIMIT = 100;
 const CLIENT_GROUP_PAGE = 10;
@@ -16,10 +16,7 @@ let filterSearch = '';
 export async function coachesPage() {
     const app = document.getElementById('app');
     app.innerHTML = `
-        <div class="page-header">
-            <h1>Coach activity</h1>
-            <div class="actions"><a href="#/" class="btn">&larr; Dashboard</a></div>
-        </div>
+        ${pageHeaderHTML('Coach activity')}
         <div id="coachesContent"><div class="spinner"></div></div>
     `;