Applied several performance and design fixes

* Fixed the monofont "Hack", which never got loaded
* Changed some Fork Awesome icons
* Added small versions of the header-background and the avatar

css/fonts.css

@@ -4,7 +4,7 @@
 @font-face {
     font-family: 'hackregular';
     src: url('fonts/hack/Hack-Regular-webfont.woff2') format('woff2'),
-         url('fonts/hack/Hack-Regular-webfont.woff') format('woff'),
+         url('fonts/hack/Hack-Regular-webfont.woff') format('woff');
     font-weight: normal;
     font-style: normal;
 

css/layout.css

@@ -66,6 +66,12 @@ header {
    overflow: hidden;
 }
 
+@media only screen and (max-width: 1920px){
+   header {
+      background: #161415 url(../images/header-background_1920.jpg) no-repeat top center;
+   }
+}
+
 /* vertically center banner section */
 header:before {
    content: '';
@@ -1010,7 +1016,7 @@ call-to-action .button {
 }
 
 #contact .oneline {
-   margin-top: 1px;
+   margin-top: 3px;
    float: left;
    margin-left: 12px;
 }