Fixed total step count. It was showing 13 steps instead of 12, which means that step 12 did not exist.
Fixed potential bug when user was not in group 'sudo' but in a group that contains 'sudo' word (example: nonsudogroup)
Lots of code refactoring/improvements! Some of them:
cb-welcome now uses array instead of copypasted code.
Since we're writing in bash, most external or deprecated commands were replaced with bash equivalents
Correct quoting of parameters! Now things wont break if one day some of the variables will contain whitespace characters.