docs: move manual validation procedure into docs

Author: themightychris

docs/SUMMARY.md

@@ -13,6 +13,7 @@
   - [The `chime-live` Cluster](./operations/chime-live-cluster.md)
   - [Deploy to Heroku](./operations/heroku.md)
   - [Deploy to Your Own Cluster](./operations/byok8s.md)
+  - [Manual Validation](./operations/manual-validation.md)
   - [Limited Cluster Access for Deployment][1]
 - [Code of Conduct](CODE_OF_CONDUCT.md)
 - [Maintainers](MAINTAINERS.md)