Added auto deprecation feature

static/index.html

@@ -10,7 +10,10 @@
 <body>
     <div class="container">
         <header>
-            <h1>SSH Key Manager</h1>
+            <div class="header-title">
+                <h1>SSH Key Manager</h1>
+                <span class="version" id="appVersion">Loading...</span>
+            </div>
             <div class="flow-selector">
                 <label for="flowSelect">Flow:</label>
                 <select id="flowSelect">