Prohibit aggresive trolling and activism

This basically covers what the Brand Guidelines have been filtering. By
adding it to the AUP prohibitions, we can remove the reference to the
Brand Guidelines, and simplify the project review process.

www/about/policies/terms-of-service.md

@@ -45,10 +45,6 @@ these Terms.
 
   1. A Participant may make payments to a Project Owner via a Project. A
      Participant who makes payments via a Project is a Giver.
-
-  1. Projects and their Work must be consistent with Gratipay's [Brand
-     Guidelines](http://inside.gratipay.com/big-picture/brand/) and Acceptable
-Use Policy.
 
   1. Gratipay reserves the right to reject, suspend, or remove a Project at any
      time, and for any reason.
@@ -205,6 +201,8 @@ disclosure policy](/about/security/).
       security numbers, credit card numbers, street addresses, phone numbers,
 confidential ID numbers, or account passwords, without their permission.
 
+    * Aggressive trolling or activism.
+
     * Account hijacking, including any access to or use of another
       Participant's account without their permission.