[Docs] Remove stale serverless page (#974)

* remove stale serverless page

* delete TODO

Author: marciw

docs/reference/getting-started-serverless.md

@@ -1,8 +1,6 @@
 toc:
   - file: index.md
-  # TO DO: Do we want these to be separate pages?
   - file: getting-started.md
-  - file: getting-started-serverless.md
   - file: installation.md
   - file: connecting.md
   - file: typed-api.md