Dev tools: remove erpc

Author: hsutaiyu

docs/tools/rpc-proxy-caching/erpc.md

@@ -433,9 +433,7 @@ nav:
           - Zapier integration: https://docs.venly.io/docs/zapier-integration
       - Chain indexer framework:
           - Overview: tools/chain-indexer-framework/overview.md
-          - Usage: tools/chain-indexer-framework/usage.md 
-      - RPC Proxy:
-          - eRPC: tools/rpc-proxy-caching/erpc.md
+          - Usage: tools/chain-indexer-framework/usage.md
       - Data:
           - Alchemy subgraphs: https://docs.alchemy.com/docs/how-to-build-and-deploy-a-subgraph-on-polygon-zkevm-using-alchemy-subgraphs
           - Covalent: tools/data/covalent.md