docs: restore long-term Strategy and separate six-month horizons

sidebars/strategy.ts

@@ -3,12 +3,14 @@ export default {
   strategySidebar: [
     'target-operating-model',
     'roadmap',
+    'six-months-target',
     {
       type: 'category',
-      label: 'One bounded experiment',
-      link: {type: 'doc', id: 'stage-01-skills-adoption'},
+      label: '6 Months Roadmap',
+      link: {type: 'doc', id: 'six-months-roadmap'},
       collapsed: true,
       items: [
+        'stage-01-skills-adoption',
         {
           type: 'category', label: 'Measurement', collapsed: true,
           link: {type: 'doc', id: 'measurement/index'},