#2257: rearrange software pages + creating a list of applications and services which is hopefully a single point that should be referred to

docs/source/simulation_components/system/services/dns_server.rst

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+.. only:: comment
+
+    © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
+
+DNSServer
+=========
+Also known as a DNS Resolver, the ``DNSServer`` provides a DNS Server simulation by extending the base Service class.
+
+Key capabilities
+^^^^^^^^^^^^^^^^
+
+- Simulates DNS requests and DNSPacket transfer across a network
+- Registers domain names and the IP Address linked to the domain name
+- Returns the IP address for a given domain name within a DNS Packet that a DNS Client can read
+- Leverages the Service base class for install/uninstall, status tracking, etc.
+
+Usage
+^^^^^
+- Install on a Node via the ``SoftwareManager`` to start the database service.
+- Service runs on TCP port 53 by default. (TODO: TCP for now, should be UDP in future)
+
+Implementation
+^^^^^^^^^^^^^^
+
+- DNS request and responses use a ``DNSPacket`` object
+- Extends Service class for integration with ``SoftwareManager``.