YTA-770: Add external link icons to YTA homepage help links. Override default icon position and file url.
YTA-770: Add external link icons to YTA homepage help links. Override default icon position and file url.

tmikus/assets-frontend,hmrc/assets-frontend,tmikus/assets-frontend,alexanderjamesking/assets-frontend,xnejp03/assets-frontend,alexanderjamesking/assets-frontend,xnejp03/assets-frontend,hmrc/assets-frontend,alexanderjamesking/assets-frontend,xnejp03/assets-frontend,tmikus/assets-frontend,hmrc/assets-frontend