category-ip-geo-detect: add checkip.amazonaws.com (#3327)

with notes for some confusing domains

data/category-companies

@@ -66,6 +66,7 @@ include:openweather
 include:oracle
 include:panasonic
 include:pccw
+include:plex
 include:qnap
 include:qualcomm
 include:qwant

data/category-ip-geo-detect

@@ -65,3 +65,5 @@ where-am-i.co
 whoer.net
 wieistmeineip.de
 wtfismyip.com
+
+full:checkip.amazonaws.com

data/plex

@@ -0,0 +1,14 @@
+# Plex Media Server domains
+# Basic domains for Plex services
+plex.com
+plex.services
+plex.tv
+plexapp.com
+
+# Note for Plex users
+# * Plex's mechanism requires certain domains to go through a direct connection.
+# * Using a proxy for these domains may cause the system to malfunction.
+# * If you wish to access plex domains through a proxy, remember to ensure the following domains remain directly connected.
+# * Related domains:
+# plex.direct
+# v4.plex.tv