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docs: Bring back some missed release/0.4.0 doc changes, fix broken links, add lychee link checker github action (#2482)

Signed-off-by: Anish <80174047+athreesh@users.noreply.github.com>
Co-authored-by: Anish <80174047+athreesh@users.noreply.github.com>

Signed-off-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>
Co-authored-by: Julien Mancuso <jmancuso@nvidia.com>
Co-authored-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>

Signed-off-by: julienmancuso <161955438+julienmancuso@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Signed-off-by: Suman Tatiraju <167138127+statiraju@users.noreply.github.com>
Signed-off-by: Anant Sharma <anants@nvidia.com>
Co-authored-by: Anant Sharma <anants@nvidia.com>
Co-authored-by: Dmitry Tokarev <dtokarev@nvidia.com>
Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>
Co-authored-by: Kristen Kelleher <kkelleher@nvidia.com>
Co-authored-by: Suman Tatiraju <statiraju@statiraju-mlt.client.nvidia.com>
Co-authored-by: Hannah Zhang <hannahz@nvidia.com>

Signed-off-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>
Co-authored-by: mohammedabdulwahhab <furkhan324@berkeley.edu>