Fix rebuild from defang-docs update

The rebuild of the knowledge base triggered from defang-docs changes.

2025-07-29T11:03:13.933-07:00Error running get_knowledge_base.py script: Traceback (most recent call last): | Error running get_knowledge_base.py script: Traceback (most recent call last):
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  | 2025-07-29T11:03:13.933-07:00  File "/app/get_knowledge_base.py", line 166, in <module> | File "/app/get_knowledge_base.py", line 166, in <module>
  | 2025-07-29T11:03:13.933-07:00    run_prebuild_script() | run_prebuild_script()
  | 2025-07-29T11:03:13.933-07:00  File "/app/get_knowledge_base.py", line 45, in run_prebuild_script | File "/app/get_knowledge_base.py", line 45, in run_prebuild_script
  | 2025-07-29T11:03:13.933-07:00    subprocess.run( | subprocess.run(
  | 2025-07-29T11:03:13.933-07:00  File "/usr/local/lib/python3.11/subprocess.py", line 571, in run | File "/usr/local/lib/python3.11/subprocess.py", line 571, in run
  | 2025-07-29T11:03:13.933-07:00    raise CalledProcessError(retcode, process.args, | raise CalledProcessError(retcode, process.args,
  | 2025-07-29T11:03:13.933-07:00subprocess.CalledProcessError: Command '['npm', '-C', '.tmp/defang-docs', 'run', 'prebuild']' returned non-zero exit status 1.