Fix version dropdown menu by copying nv-versions.json files

[Copilot]

The version dropdown menu in the documentation was broken because the build scripts were missing the step to copy nv-versions.json files to the build output directory.

The issue occurred because:

• The documentation configuration files (conf.py) reference nv-versions.json files for the version switcher functionality
• The build scripts (build_docs.sh) were only copying versions.json files, not the required nv-versions.json files
• This caused the version dropdown menu to fail to load the version information

The fix adds a single line to each of the three build scripts to copy the nv-versions.json file alongside the existing versions.json copy:

# to support version dropdown menu
cp ./versions.json build/html
cp ./nv-versions.json build/html  # Added this line

This ensures that the version switcher has access to the correct JSON files that contain the version information with proper URLs for navigation between different documentation versions.

Fixes #885.

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[leofang]

Let me admin-merge this to land the fix sooner.

[github-actions]

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