Remove expander CSS
#333 -> -neutral1
hexa colours have 6 digits
Remove unused vars and use vars where appropriate
Deprecate .type-6
Deprecate %type-1
Deprecate type-3
Deprecate type-4
Deprecate type-9
Deprecate type-11
Deprecate type-12
Deprecate type-2
Deprecate type-8
Merge pull request #3385 from guardian/remove-unused-css

CSS cleaning