Add govuk-content-schemas to Core and Custom teams
Add govuk-content-schemas to Core and Custom teams

This repo is relevant to all teams and is currently missing from the the Seal's morning announcement. This commit adds it to both teams' lists of repos.
bitzesty/seal,livestax/seal,benlovell/seal,policygenius/seal,policygenius/seal,livestax/seal,bitzesty/seal,binaryberry/seal,envato/seal,Automattic/seal,nLight/seal,binaryberry/seal,stig/seal,christophwong/seal,stig/seal,nLight/seal,christophwong/seal