HHCOC-59: Implemented HHC news twitter feed widget
HHCOC-61: Tidy up of advanced search page
HHCOC-62: Replaced finalised icons; Modified headers/spacing
HHCOC-57: Added HHC logo with text embedded; changed header spacing; removed home link item
Fixed about link in body text
HHCOC-68: Implemented archive collection and archive item icons; Changed archive collection sub-menu colour to match icon
HHCOC-65: Modified text on 'Start search' page
HHCOC-60: Changed footer spacing; Replaced feedback link with more prominent tab
HHCOC-63: Minor text/layout improvements
Minor changes to improve style/layout/spacing
Added relevant meta tags to layout