change mirrors to kernel.org
Wrap all Jig run methods in an exception handler.

This makes error handling in delayed_jobs simpler and more robust by
making sure that all errors are trapped and reported in the runlog
without having to manually do it every time.
fix link
point fast start to base install

the base links to docker - deep links do not help
links for ISOs
more tweaks
Update contributing.md
upgrade icons for red/green and revert attrib type check