Improve tagline
STC-0012
STC-0013
STC-0014
Simplify template
add CSS entries to format highlighted code entries
Improve colors of severity levels
STC-0015
STC-0016
STC-0017
Display a label when there is no rule
STC-0018
STC-0019
Add missing anchors
STC-0003
use a warning box to inform about the no rule -> code review
STC-0004
STC-0005
STC-0006
STB-0014