Add GitHub social icon (#48)

* add github social link

* add github css

* fix css error breaking rollover

exampleSite/config.toml

@@ -22,6 +22,7 @@ enableRobotsTXT = true
   twitter = "https://twitter.com/GoHugoIO"
   instagram = ""
   youtube = ""
+  github = ""
   # choose a background color from any on this page: http://tachyons.io/docs/themes/skins/ and preface it with "bg-"
   background_color_class = "bg-black"
   featured_image = "/images/gohugo-default-sample-hero-image.jpg"

layouts/partials/social-follow.html

@@ -20,3 +20,8 @@
     {{ partial "svg/youtube.svg" (dict "size" $icon_size) }}
   </a>
 {{ end }}
+{{ with .Site.Params.github }}
+  <a href="{{ . }}" class="link-transition github link dib z-999 pt3 pt0-l mr3" title="Github link">
+    {{ partial "svg/github.svg" (dict "size" $icon_size) }}
+  </a>
+{{ end }}

layouts/partials/svg/github.svg

@@ -0,0 +1,3 @@
+<svg {{ with .size }} height="{{ . }}" {{ end }} style="enable-background:new 0 0 25 25;" version="1.1" viewBox="0 0 25 25" width="{{ .size }}" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" >
+  <path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12"/>
+</svg>

src/css/_social-icons.css

@@ -1,4 +1,4 @@
-.facebook, .twitter, .instagram, .youtube {
+.facebook, .twitter, .instagram, .youtube, .github {
   fill: #BABABA;
 }
 .facebook:hover {
@@ -16,3 +16,7 @@
 .youtube:hover {
   fill: #bb0000;
 }
+
+.github:hover {
+  fill: #FFFFFF;
+}