Update website/src/pages/en/subgraphs/guides/agent0.mdx

Co-authored-by: Benoît Rouleau <1059139+benface@users.noreply.github.com>

Author: brandonleekramer

website/src/pages/en/subgraphs/guides/agent0.mdx

@@ -1,4 +1,7 @@
-# Agent0 Subgraphs (ERC-8004)
+---
+title: Agent0 Subgraphs (ERC-8004)
+sidebarTitle: Agent0 Subgraphs
+---
 
 The **Agent0 Subgraphs** index the [ERC-8004 Trustless Agents](https://eips.ethereum.org/EIPS/eip-8004) registries — Identity, Reputation, and Validation — across five major networks. They give developers a single GraphQL interface to discover agents, filter by capability, query reputation, and track validation outcomes in real time.