self host avatar, no longer linking to gravatar.

input/index.md

 
 # Hi there!
 
-<div id="index-avatar"></div>
+<img id="index-avatar" src="img/ava.jpg">
 
 I'm a <!--%
 from datetime import datetime

static/css/style.css

     border-width: 2px;
     border-style: solid;
     border-radius: 10px;
-    background-image: url(https://www.gravatar.com/avatar/8d18fec40a74782052fb4c007d212475?s=150);
     margin-left: 2em;
     margin-bottom: 1em;
 }