Change APL getting started guide to KBL getting started guide;
Merge some of the contents into preempt-rt getting started guide;
Move the modified kbl getting started guide to the behind of the configuration tutorials;
Fix issues for acrn_quick_setup.sh script.
Signed-off-by: lirui34 <ruix.li@intel.com>
ACRN tag is ONLY specific to one Clear Linux version.
For the tutorials, we just need to make sure the validated version is functional.
Signed-off-by: lirui34 <ruix.li@intel.com>