The GitHub actions were running everytime a new commit was made to the
repo, but that wasn't needed. For example, we don't need to try to
create a new docker image if the libraries didn't change, same to build
the whole site after a change in the README.md.
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Signed-off-by: George Araújo <george.gcac@gmail.com>
Added GitHub action to check for broken links in repo before commit,
ignoring files with liquid tags since these were not yet processed and
also README since some sites created from this template doesn't have
valid urls anymore. Fixed some broken links in repo.
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Signed-off-by: George Araújo <george.gcac@gmail.com>