docs: remove username autocomplete section (#200)

docs: remove username autocomplete section from usernames doc

The autocomplete feature documentation doesn't belong in the lookup API docs.
This content is better suited for UI component documentation elsewhere.

Author: broodling-bot

src/pages/controller/usernames.md

@@ -9,16 +9,6 @@ title: Username Lookup
 A service for looking up usernames and addresses in the Cartridge ecosystem.
 You can use either the helper methods from the SDK or query the endpoint directly.
 
-## Username Autocomplete
-
-When creating a new controller, Cartridge now provides an enhanced username input with real-time autocomplete functionality.
-As you type a username, the system will query existing usernames and render a list of matches for easy selection.
-This feature makes it easier for users to discover and connect to existing controllers.
-
-:::tip
-The autocomplete feature uses the same GraphQL `searchAccounts` query described in the API section below, providing up to 5 matching results with a 300ms debounce for optimal performance.
-:::
-
 ## Direct API Access
 
 ### Account Lookup Endpoint
@@ -32,23 +22,6 @@ curl -X POST \
   https://api.cartridge.gg/accounts/lookup
 ```
 
-### Account Search GraphQL Query
-
-For real-time username search (used by the autocomplete feature), you can use the GraphQL endpoint:
-
-```graphql
-query AccountSearch($query: String!, $limit: Int = 5) {
-  searchAccounts(query: $query, limit: $limit) {
-    username
-    credits {
-      amount
-      decimals
-    }
-    updatedAt
-  }
-}
-```
-
 This query returns matching usernames along with their credit information and last update timestamp, perfect for implementing search and autocomplete functionality.
 
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