These changes will be made on the https://github.com/apache/grails-static-website/tree/asf-site-production branch since the legacy pages are no longer generated

1. https://grails.apache.org/api.html
2. https://grails.apache.org/buildstatus.html
3. https://grails.apache.org/community-code-of-conduct.html
4. https://grails.apache.org/community-guidelines.html
5. https://grails.apache.org/foundation/* - redirect old foundation pages
6. https://grails.apache.org/privacy-policy.html - removed since we reference the ASF one instead
7. https://grails.apache.org/templates/plugins.html