remove startup program page from sidenav

Author: pwseg

src/_data/sidenav/main.yml

@@ -102,8 +102,6 @@ sections:
       title: 'MTUs, Throughput and Billing'
     - path: /guides/usage-and-billing/discounts-for-startups-npos
       title: Discounts or Coupons
-    - path: /guides/usage-and-billing/startup-program
-      title: Segment Startup Program
 - section_title: Connections
   section:
   - path: /connections