Add css customization

_layouts/base.html

@@ -20,6 +20,7 @@
 	<link rel="apple-touch-icon" href="https://p2pu.org/static/images/apple-touch-icon.png">
 
 	<link rel="stylesheet" href="{{ site.baseurl }}/css/p2pustrap-custom.css" />
+	<link rel="stylesheet" href="{{ site.baseurl }}/css/site.css" />
 	<link rel="shortcut icon" href="{{ site.baseurl }}/img/favicon.ico">
 	<script type="text/javascript" src="{{ site.baseurl }}/js/modernizr-2.6.2.min.js"></script>
 </head>

css/site.css

@@ -1,8 +1,3 @@
-.profile-picture {
-    max-width: 100px;
-    max-height: 100px;
-}
-
-.container img {
+.content img {
     max-width: 100%;
 }