Removed reference to OSPO newsletter page

OSPO newsletter link goes to an outdated page

Author: karasowles

README.md

@@ -36,8 +36,6 @@ We have used those as placeholder values where our policies point to internal on
   - [Gaining insights into your contributors](./docs/contributor-insights.md)
   - [Managing dependencies at scale](./docs/managing-dependencies-at-scale.md)
   - [Keeping repository maintainer information accurate](./docs/keeping-ownership-updated.md)
-- Misc
-  - [Internal OSPO newsletters](./newsletter%20template)
 
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