state vcpkg toolchain needs a fresh build

[shaosu-nvidia]

Description

Update doc to state that oak needs vcpkg toolchain configured on a fresh build so need to delete the existing one.
Fixes #893

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Testing

N/A

Checklist

• I have read and understood the contribution guidelines
• I have run the linter and formatter with SKIP=check-copyright-year pre-commit run --all-files
• I have made corresponding changes to the documentation
• I have added tests that prove my fix/feature works (or explained why not) not applicable
• I have signed off all my commits (git commit -s) per the DCO

Summary by CodeRabbit

• Documentation
  • Updated OAK camera build instructions to clarify that toolchain settings apply only during initial configuration.
  • Added guidance to remove the existing build directory before running CMake.

[coderabbitai]

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📝 Walkthrough

Walkthrough

The OAK camera build instructions now state that CMAKE_TOOLCHAIN_FILE applies only during initial CMake configuration. The instructions remove the existing build/ directory before running CMake. This prevents reuse of a build tree configured without the vcpkg toolchain.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documentation change requiring a fresh build for the vcpkg toolchain.
Linked Issues check	✅ Passed	The documentation requires deleting the existing build directory before configuring the OAK plugin with the vcpkg toolchain, satisfying issue #893.
Out of Scope Changes check	✅ Passed	The changes are limited to OAK build documentation and directly address issue #893.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ssx/oak_configure

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