doc: added comments and updated to latest ashautentication version and required changes

lib/mv_web/controllers/page_html/home.html.heex

@@ -1,3 +1,6 @@
+<!--
+THIS IS JUST THE ASHAUTHENTICATION EXAMPLE - WE NEED TO CHANGE IT LATER
+-->
 <nav class="bg-gray-800">
   <div class="px-2 mx-auto max-w-7xl sm:px-6 lg:px-8">
     <div class="relative flex items-center justify-between h-16">
@@ -5,7 +8,7 @@
         <div class="block ml-6">
           <div class="flex space-x-4">
             <div class="px-3 py-2 text-xl font-medium text-white ">
-              Ash Demo
+              Mitgliederverwaltung
             </div>
           </div>
         </div>