Remove custom privacy page

The new ASF data privacy policy requires some changes to the site.

The Apache Software Foundation takes privacy seriously and works towards becoming compliant with the GDPR (the European Union's General Data Protection Regulation). In this first step we are trying to make publicly-visible websites and services GDPR compliant.

All websites run by the ASF must be compliant with the new website privacy policy and add a link to it:
https://privacy.apache.org/policies/privacy-policy-public.html

Please remove all “custom” privacy policies.

Jackrabbit page footers already have a link to the ASF privacy policy but the custom privacy policy page must be removed.