Remove Entity Explorer card from post annotations docs

Mintlify-Source: dashboard-editor

Author: mintlify[bot]

x-api/fundamentals/post-annotations.mdx

@@ -223,9 +223,6 @@ Coverage varies by domain and market.
 ## Resources
 
 <CardGroup cols={2}>
-  <Card title="Entity Explorer" icon="flask" href="https://tweet-entity-extractor.glitch.me/">
-    Interactive tool to discover annotations.
-  </Card>
   <Card title="Context Entity List" icon="github" href="https://github.com/xdevplatform/twitter-context-annotations">
     CSV of available context annotation entities.
   </Card>