Remove 'Process readiness guide' from documentation

Removed the 'Process readiness guide' link from related resources.

Author: whoiskatrin

src/content/docs/sandbox/api/commands.mdx

@@ -319,5 +319,4 @@ await server.waitForLog('Ready', 30000);
 ## Related resources
 
 - [Background processes guide](/sandbox/guides/background-processes/) - Managing long-running processes
-- [Process readiness guide](/sandbox/guides/process-readiness/) - Wait for services to be ready
 - [Files API](/sandbox/api/files/) - File operations