added author page #6433

Add the author page and provide the link at autho of blog page
```jinja
 <section class="blog-heading">
   <div class="container">
     <h1 class="white-text-color margin-0">{% block pagetitle %}{% trans %}Blog{% endtrans %}{% endblock pagetitle %}</h1>
     <ol class="breadcrumb remove-background padding-0 margin-0">
       <li><a class="white-text-color" href="{{ SITE_ROOT }}index.html">{% trans %}Home{% endtrans %}</a></li>
       {% block breadcrumb %}
         <li class="white-text-color">{% trans %}Blog{% endtrans %}</li>
       {% endblock breadcrumb %}
     </ol>
   </div>
 </section>
```