encourage people using web extension

fix https://github.com/lesspass/lesspass/issues/63

index.html

@@ -166,6 +166,9 @@
             <div class="row">
                 <div id="hero__password-generator-block" class="col-lg-6 push-lg-6">
                     <div id="lesspass"></div>
+                    <div class="text-xs-center text-sm-right">
+                        <small><span class="text-white"><i class="fa fa-shield" aria-hidden="true"></i> For more security use browser extensions</span></small>
+                    </div>
                 </div>
                 <div id="hero-text" class="col-lg-6 pull-lg-6">
                     <h1 class="display-5">Next-Gen Open Source Password Manager</h1>
@@ -204,8 +207,7 @@
             <div class="col-md-6 col-lg-3 mb-3">
                 <div class="media">
                     <div class="media-left">
-                        <img class="media-object feature-image" src="dist/no-cloud.png"
-                             alt="No Cloud">
+                        <img class="media-object feature-image" src="dist/no-cloud.png" alt="No Cloud">
                     </div>
                     <div class="media-body">
                         <h4 class="media-heading">No storage</h4>