feat(panel.html): add description and classes to table

judas_server/web/templates/panel.html

@@ -13,7 +13,10 @@
             <p><a class="button" href="{{ url_for('logout') }}">Logout</a></p>
         </header>
         <main>
-            <table border="1">
+            <h2 class="center">Select a PC to Control</h2>
+            <p class="center">Choose a PC from the list below to view details or send commands.</p>
+            <br>
+            <table class="center-table select-table">
                 <thead>
                     <tr>
                         <th>PC ID</th>