Convert the social menu to a config driven version

config/_default/menu.yaml

@@ -11,3 +11,29 @@ main:
     name: About
     url: /about/
     weight: 30
+social:
+  - identifier: twitter
+    name: Twitter
+    url: https://twitter.com/erynofwales
+    weight: 10
+    params:
+      shortName: tw
+  - identifier: github
+    name: Github
+    url: https://github.com/erynofwales
+    weight: 20
+    params:
+      shortName: gh
+  - identifier: instagram
+    name: Instagram
+    url: https://instagram.com/erynofwales
+    weight: 30
+    params: 
+      shortName: ig
+  - identifier: feed
+    name: Feed
+    url: /feed.atom
+    weight: 40
+    params:
+      shortName: feed
+      targetBlank: false