add keynotes to menu

and slightly change wording of 2025 menu items to hopefully make it clearer that they are last year's

Author: nlharris

hugo.yaml

@@ -95,12 +95,15 @@ menu:
     - name: 'Submit an abstract'
       parent: 'bosc'
       url: 'events/bosc-2026/submit/'
-      weight: 1
-    - name: 'Schedule (2025)'
+      weight: 2
+    - name: 'Keynotes (NEW)'
+      parent: 'bosc'
+      url: 'events/bosc-2025/bosc-2025-schedule/'
+    - name: '(2025 Schedule)'
       parent: 'bosc'
       url: 'events/bosc-2025/bosc-2025-schedule/'
       weight: 2
-    - name: 'Panel (2025)'
+    - name: '(2025 Panel)'
       weight: 4
       parent: 'bosc'
       url: 'events/bosc-2025/panel/'