[lint demo] Remove css lint example
[lint demo] Remove css lint example

Since the only pre-build version of csslint was changed to some
global-scope-polluting mess that breaks our module loader headers.

Issue #4123

sourcelair/CodeMirror,mtaran-google/CodeMirror,TDaglis/CodeMirror,ficristo/CodeMirror,MarcelGerber/CodeMirror,rrandom/CodeMirror,grzegorzmazur/CodeMirror,MarcelGerber/CodeMirror,INTELOGIE/CodeMirror,sourcelair/CodeMirror,adobe/CodeMirror2,kerabromsmu/CodeMirror,hackmdio/CodeMirror,sourcelair/CodeMirror,jkaplon/CodeMirror,alur/CodeMirror,xeronith/CodeMirror,kerabromsmu/CodeMirror,mizchi/CodeMirror,thomasjm/CodeMirror,namin/CodeMirror,INTELOGIE/CodeMirror,ficristo/CodeMirror,mizchi/CodeMirror,notepadqq/CodeMirror,adobe/CodeMirror2,rrandom/CodeMirror,rrandom/CodeMirror,mizchi/CodeMirror,thomasjm/CodeMirror,adobe/CodeMirror2,jkaplon/CodeMirror,Dominator008/CodeMirror,wingify/CodeMirror,jkaplon/CodeMirror,hackmdio/CodeMirror,grzegorzmazur/CodeMirror,dperetti/CodeMirror,wingify/CodeMirror,Dominator008/CodeMirror,schanzer/CodeMirror,mtaran-google/CodeMirror,grzegorzmazur/CodeMirror,pabloferz/CodeMirror,ejgallego/CodeMirror,thomasjm/CodeMirror,codio/CodeMirror,pabloferz/CodeMirror,jayaprabhakar/CodeMirror,nightwing/CodeMirror,crazy4chrissi/CodeMirror,TDaglis/CodeMirror,TDaglis/CodeMirror,ficristo/CodeMirror,hackmdio/CodeMirror,dperetti/CodeMirror,codio/CodeMirror,INTELOGIE/CodeMirror,jayaprabhakar/CodeMirror,codio/CodeMirror,schanzer/CodeMirror,SidPresse/CodeMirror,SidPresse/CodeMirror,namin/CodeMirror,nightwing/CodeMirror,jayaprabhakar/CodeMirror,xeronith/CodeMirror,crazy4chrissi/CodeMirror,ejgallego/CodeMirror,MarcelGerber/CodeMirror,dperetti/CodeMirror,ejgallego/CodeMirror,xeronith/CodeMirror,wingify/CodeMirror,namin/CodeMirror,Dominator008/CodeMirror,schanzer/CodeMirror,notepadqq/CodeMirror,nightwing/CodeMirror,mtaran-google/CodeMirror,alur/CodeMirror,SidPresse/CodeMirror,kerabromsmu/CodeMirror,crazy4chrissi/CodeMirror,alur/CodeMirror,notepadqq/CodeMirror,pabloferz/CodeMirror