Add FAQ to explain that there are no geo/IP restrictions

Fixes nasa-gcn#2671.

app/routes/docs.faq/route.mdx

@@ -130,3 +130,9 @@ If you had a GCN Circulars account prior to April 17, 2023, your account was mig
 - Responses to questions and requests through the [GCN help desk](/contact) may be delayed.
 - Issues and pull requests on https://github.com/nasa-gcn repositories may not be promptly reviewed.
 - There will be no [redeployments](/docs/contributing/deployment) of the GCN web site except to address emergencies.
+
+### Does GCN block IP addresses or connections from certain countries?
+
+**No.** The GCN web site and Kafka brokers accept connections from anywhere in
+the world. GCN does not block any IP addresses based on geographic locations or
+countries of origin.