docs(eol): add EOL options text and link to template header used in every page

Closes #17164

Author: Ed Clement

docs/config/templates/app/indexPage.template.html

@@ -145,12 +145,8 @@ <h4 class="search-results-group-heading">{{ key }}</h4>
       <nav id="navbar-notice" class="navbar navbar-fixed-top">
         <div class="navbar-inner">
           <div class="container">
-            <p class="site-notice visible-phone">
-              This site refers to AngularJS (v1.x). <a href="https://angular.io/">Go to the latest Angular</a>.
-            </p>
-            <p class="site-notice visible-desktop">
-              This site and all of its contents are referring to AngularJS (version 1.x),
-              if you are looking for the latest Angular, please visit <a href="https://angular.io/">angular.io</a>.
+            <p class="site-notice">
+              AngularJS is now in Long Term Support (LTS) mode: <a href="https://docs.angularjs.org/misc/version-support-status">Find out more</a>. Explore End Of Life (EOL) options <a href="https://blog.angular.io/finding-a-path-forward-with-angularjs-7e186fdd4429">here</a>.
             </p>
           </div>
         </div>