Document location of CERN download URL in repository analysis

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This PR provides analysis and documentation of where the download link https://nnpdf.web.cern.ch/nnpdf/tables/ is located within the NNPDF repository structure.

Summary

The URL https://nnpdf.web.cern.ch/nnpdf/tables/ is found in the repository at:

Primary Location:

• /validphys2/src/validphys/nnprofile_default.yaml (line 50)

Usage Context:
The URL serves as one of the theory repository URLs in the NNPDF configuration system:

theory_urls:
    - 'https://nnpdf.web.cern.ch/nnpdf/tables/'
    - 'https://nnpdf.web.cern.ch/nnpdf/tables_box/'

Implementation Details:

• Used by the RemoteLoader class in /validphys2/src/validphys/loader.py
• Accessed via the theory_urls property and utilized in the remote_theories method
• Enables downloading of theory files and data required for NNPDF operations
• Part of the broader NNPDF profile configuration system documented in /doc/sphinx/source/vp/nnprofile.rst

The URL functions as a repository endpoint for NNPDF theory data that can be downloaded and cached locally by the framework during operations.

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