Fix Pages build failure by removing orphaned submodule gitlink

[Copilot]

The GitHub Actions build job for Pages was failing during checkout because the repository contained a submodule gitlink (internship2026) without a corresponding .gitmodules entry. This change removes the invalid gitlink so recursive submodule checkout can complete.

• Root cause

  • Repository index tracked internship2026 as a submodule entry (160000 mode), but no submodule URL mapping existed.

• Change made

  • Removed the orphaned gitlink entry for internship2026 from the repository index/tree.
  • No workflow logic or application code was modified.

• Why this unblocks CI

  • actions/checkout with submodules: recursive no longer hits:
    fatal: No url found for submodule path 'internship2026' in .gitmodules.

# Before: orphaned gitlink present
git ls-files -s | awk '$1==160000 {print}'
# 160000 <sha> 0 internship2026

# After: no orphaned submodule entries remain
git ls-files -s | awk '$1==160000 {print}'
# (no output)