Add Event Awards link to OBF menu

I was surprised to see that the OBF main menu doesn't include Event Awards - shouldn't it? (Didn't it, at some point?) So I added it, but I don't fully understand how the weights are used, and particularly how menu items are ordered if they lack weights (as some of them do). So this PR may need some tweaking.

Author: nlharris

hugo.yaml

@@ -64,6 +64,11 @@ menu:
     - name: 'Get Involved'
       parent: 'about'
       url: 'get-involved'
+      weight: 5
+    - name: 'OBF Event Awards"
+      parent: 'about'
+      url: /event-awards/
+      weight: 4
     - name: 'Diversity, Equity & Inclusion'
       parent: 'about' 
       url: '/obf-dei/'