Delete features that relied on Digicert and create redirects

Author: RebeccaTamachiro

public/_redirects

@@ -1010,6 +1010,7 @@
 /ssl/certificate-transparency-monitoring/ /ssl/edge-certificates/additional-options/certificate-transparency-monitoring/ 301
 /ssl/client-certificates/byo-ca-api-shield/ /ssl/client-certificates/byo-ca/ 301
 /ssl/edge-certificates/certificate-transparency-monitoring/ /ssl/edge-certificates/additional-options/certificate-transparency-monitoring/ 301
+/ssl/edge-certificates/changing-dcv-method/methods/email/ /ssl/edge-certificates/changing-dcv-method/methods/ 301
 /ssl/edge-certificates/custom-certificates/caa-records/ /ssl/edge-certificates/caa-records/ 301
 /ssl/edge-certificates/disable-weak-cipher-suites/ /ssl/edge-certificates/additional-options/cipher-suites/customize-cipher-suites/ 301
 /ssl/edge-certificates/http-strict-transport-security/ /ssl/edge-certificates/additional-options/http-strict-transport-security/ 301
@@ -1042,6 +1043,8 @@
 /cloudflare-for-platforms/cloudflare-for-saas/start/hostname-verification-backoff-schedule/ /cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/backoff-schedule/ 301
 /cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-verification/ /cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/ 301
 /cloudflare-for-platforms/cloudflare-for-saas/reference/status-codes/certificate-authority-specific/ /cloudflare-for-platforms/cloudflare-for-saas/reference/status-codes/ 301
+/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/validate-certificates/cname/ /cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/validate-certificates/ 301
+/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/validate-certificates/email/ /cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/validate-certificates/ 301
 
 # workers for platforms
 /cloudflare-for-platforms/workers-for-platforms/learning/ /cloudflare-for-platforms/workers-for-platforms/reference/ 301