feat: add Ahrefs policy definition

Ahrefs is a large SEO company used by single bloggers to large
enterprises. It may be beneficial to allow (or deny) them in Anubis. They
do publish rDNS entries, so once an Anubis version with TecharoHQ#682 is released,
this policy would benefit from setting up that check.

Further information: https://ahrefs.com/robot

Author: herrbischoff

data/services/ahrefs.yaml

@@ -0,0 +1,57 @@
+- name: ahrefs
+  user_agent_regex: (AhrefsBot|AhrefsSiteAudit)
+  action: ALLOW
+  # https://api.ahrefs.com/v3/public/crawler-ip-ranges
+  remote_addresses: [
+    "5.39.1.224/27",
+    "5.39.109.160/27",
+    "15.235.27.0/24",
+    "15.235.96.0/24",
+    "15.235.98.0/24",
+    "37.59.204.128/27",
+    "51.68.247.192/27",
+    "51.75.236.128/27",
+    "51.89.129.0/24",
+    "51.161.37.0/24",
+    "51.161.65.0/24",
+    "51.195.183.0/24",
+    "51.195.215.0/24",
+    "51.195.244.0/24",
+    "51.222.95.0/24",
+    "51.222.168.0/24",
+    "51.222.253.0/26",
+    "54.36.148.0/23",
+    "54.37.118.64/27",
+    "54.38.147.0/24",
+    "54.39.0.0/24",
+    "54.39.6.0/24",
+    "54.39.89.0/24",
+    "54.39.136.0/24",
+    "54.39.203.0/24",
+    "54.39.210.0/24",
+    "92.222.104.192/27",
+    "92.222.108.96/27",
+    "94.23.188.192/27",
+    "142.44.220.0/24",
+    "142.44.225.0/24",
+    "142.44.228.0/24",
+    "142.44.233.0/24",
+    "148.113.128.0/24",
+    "148.113.130.0/24",
+    "167.114.139.0/24",
+    "168.100.149.0/24",
+    "176.31.139.0/27",
+    "198.244.168.0/24",
+    "198.244.183.0/24",
+    "198.244.186.193/32",
+    "198.244.186.194/31",
+    "198.244.186.196/30",
+    "198.244.186.200/31",
+    "198.244.186.202/32",
+    "198.244.226.0/24",
+    "198.244.240.0/24",
+    "198.244.242.0/24",
+    "202.8.40.0/22",
+    "202.94.84.110/31",
+    "202.94.84.112/31",
+  ]