style.css: fix overqualified selectors, don't use the universal selector, move a couple of bootstrap overrides in the appropriate place
style.css: fix overqualified selectors, don't use the universal selector, move a couple of bootstrap overrides in the appropriate place

kasper93/mpc-hc.org,mpc-hc/mpc-hc.org,mpc-hc/mpc-hc.org,kasper93/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,Underground78/mpc-hc.org,FeodorFitsner/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,mpc-hc/mpc-hc.org