Revert "global footer: change visible text of support link to email address"
Revert "global footer: change visible text of support link to email address"

This reverts commit 01be2f635a3a3307bb5bdcdacee62992afa0c747. Long email address determined ugly.

alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend