Missing CSP header

[RishiRajSahu]

It has been reported by our security softwares that this domain doesn't contains CSP as response headers, Though this domain accounts.topcoder.com is not in use any more and just redirects to new login page still creating this issue to keep track and could be resolved once we remove entry for this domain from Route53

For more details follow here https://topcoder.atlassian.net/browse/VULN-1938

fyi @sachin-maheshwari @mtwomey