Updating test hyperlink option

Updating test hyperlink option

Suggested Linkchecker software is no longer maintained further it
requires python 2 rather python 3. Further after testing Linkchecker I
found that it missed many links.

I have tried broken-link-checker npm package which detects many of the
links not detected by Linkchecker. Therefore proposing using this new
software for checking website links.

Bug-AGL: [SPEC-4470]
Signed-off-by: Vinod Ahuja <vahuja@unomaha.edu>
Change-Id: If1913104225f4b97c4b1265bdeace4b214128d6c
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/28301
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>