cmd/anubis: delete example RSS reader rule (#67)

The example/default bot policy document had a rule to allow RSS readers
through based on paths that end with ".rss", ".xml", ".atom", or
".json". Frameworks like Rails will treat these specially, meaning that
going to /things/12345-whateverhaha.json could bypass Anubis.

I checked the history of this rule and it was present in the original
example policy file in Xe/x. This rule is likely a mistake and it has
been removed. I think it was for making my blog still work with RSS
readers.

Thanks to Graham Sutherland for reporting this over email.

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/anubis/botPolicies.json

@@ -363,11 +363,6 @@
       "path_regex": "^/robots.txt$",
       "action": "ALLOW"
     },
-    {
-      "name": "rss-readers",
-      "path_regex": ".*\\.(rss|xml|atom|json)$",
-      "action": "ALLOW"
-    },
     {
       "name": "lightpanda",
       "user_agent_regex": "^Lightpanda/.*$",