fix toc depth

Author: yanganto

README.md

@@ -18,8 +18,6 @@ Directory tracking developer tools and infrastructure projects within Sui ecosys
   - [Client Libraries](#client-libraries)
 - [dApp Development](#dapp-development)
   - [dApp Toolkits](#dapp-toolkits)
-    - [zkLogin](#zklogin)
-    - [Misc](#misc)
   - [Smart Contract Toolkits](#smart-contract-toolkits)
 - [Indexers \& Data Services](#indexers--data-services)
 - [Explorers](#explorers)