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feat: check for broken symlinks. add back lychee external link checker with retries to fix failure (#4125)
Signed-off-by: Nate Mailhot <nmailhot@nvidia.com>

Signed-off-by: Hannah Zhang <hannahz@nvidia.com>
Signed-off-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>
Co-authored-by: Hongkuan Zhou <tedzhouhk@gmail.com>

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: hongkuan <hongkuanz@nvidia.com>
Co-authored-by: mohammedabdulwahhab <furkhan324@berkeley.edu>
Co-authored-by: Hongkuan Zhou <tedzhouhk@gmail.com>