Updates the overview section of the API documentation - take 1
Updates the overview section of the API documentation - take 1

hlmnrmr/superdesk-content-api,ioanpocol/superdesk-content-api,ioanpocol/superdesk-content-api,sivakuna-aap/superdesk-content-api,mugurrus/superdesk-content-api,sivakuna-aap/superdesk-content-api,hlmnrmr/superdesk-content-api,superdesk/superdesk-content-api,mugurrus/superdesk-content-api,superdesk/superdesk-content-api