tutorial section 7.3 - finished error message output + styling
section 7.4.1 - added redirect after successful user create
proper tdd: exercise 7.6 (writing a test case) before section 7.3.3

test case for section 7.4.1
test case for section 7.4.1
section 7.4.3 - merged test cases and fixed them with this weird describe-before-structure