Update bug filing info

This project doesn't have a Launchpad bug tracker set up, so remove
that link and explain the informal process currently being used for
handling bugs.

Change-Id: Ie923539358a70559d7e7a2440333a2b5d732a8b6

CONTRIBUTING.rst

@@ -2,8 +2,9 @@
 Contributing
 ============
 
-If you would like to contribute to the development of OpenStack,
-you must follow the steps in this page:
+If you would like to contribute to the development of OpenStack or
+OpenStack-related projects like this one you must follow the steps
+in this page:
 
    http://docs.openstack.org/infra/manual/developers.html
 
@@ -15,6 +16,11 @@ the workflow documented at:
 
 Pull requests submitted through GitHub will be ignored.
 
-Bugs should be filed on Launchpad, not GitHub:
+Bugs
+====
 
-   https://bugs.launchpad.net/gerrit-dash-creator
+This is an informal OpenStack-related project that doesn't have an official bug
+tracker.  If you notice a problem, feel free to fix it and post a patch to
+Gerrit (see above).  If you notice a problem but aren't sure how to fix it,
+please mention it in #openstack-infra on Freenode, where you may get some
+advice for fixing it, or you can at least let us know that there's an issue.