As part of legacy/trac#30472, we are setting up a service on polyanthum that allows bridge operators to test the TCP reachability of their obfs4 port. We would like to expose the service over a URL such as bridges.torproject.org/scan/. This seems to require a new `ProxyPass` directive in the file `/etc/apache2/sites-enabled/bridges.torproject.org.conf`. What's the process for modifying this file? Is it under version control? If so, how do we commit a change to this version control system?