fix: remove subheading

pages/omni-account/use-cases.mdx

@@ -1,7 +1,5 @@
 # Use Cases Beyond Chain Abstraction
 
-## Vision for Omni Account
-
 **The vision for Omni Account goes beyond solving Ethereum’s fragmented liquidity**. Omni Account allows users to express any intent to a specialized execution layer without the strict requirement of atomized settlement. Our vision is to enable application-specific Orchestrators to plug into Omni Account and process intents against a single resource-locked balance per user. 
 
 From debit card integrations to offchain order books, Omni Account’s architecture is designed to make resource locks fully open and composable to any developer. One single balance with infinite possibilities — **everything everywhere, all at once**.