docs: remove broken banner image from mocking page

Delete the invalid top image reference on the Mocking & Testing SDK page to avoid broken rendering.

Made-with: Cursor

Author: VinciGit00

sdks/mocking.mdx

@@ -4,12 +4,6 @@ description: 'Test ScrapeGraphAI v2 functionality without consuming API credits'
 icon: 'test-tube'
 ---
 
-<img
-  style={{ borderRadius: '0.5rem' }}
-  src="https://raw.githubusercontent.com/VinciGit00/Scrapegraph-ai/main/docs/assets/api-banner.png"
-  alt="ScrapeGraph API Banner"
-/>
-
 <CardGroup cols={2}>
   <Card title="Standard Libraries" icon="test-tube">
     Use familiar testing tools for mocking