proxy-redirects: redirect getfedora.org/code-of-conduct.html to docs

Related to 4547a73ef ("mailman: fix footer link for CoC", 2019-06-11),
for https://pagure.io/fedora-infrastructure/issue/7893.

playbooks/include/proxies-redirects.yml

@@ -267,6 +267,12 @@
     path: /code-of-conduct
     target: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
 
+  - role: httpd/redirect
+    shortname: code-of-conduct-3
+    website: getfedora.org
+    path: /code-of-conduct.html
+    target: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
+
   - role: httpd/redirect
     shortname: verify
     website: fedoraproject.org