Remove "Recursive DNS server" text

Configuration.md

@@ -5,7 +5,6 @@ Most of these settings can be changed via the web-based admin interface. However
 * [Command-line arguments](#command-line)
 * [Configuring upstreams](#upstreams)
   * [Specifying upstreams for domains](#upstreams-for-domains)
-  * [Recursive DNS server](Unbound.md)
 * [Configuring clients friendly names](#friendly-names)
 * [Configuration file](#configuration-file)
 

Unbound.md

@@ -1,23 +0,0 @@
-# Recursive DNS server
-
-A recursive DNS server doesn't require an upstream server to resolve a domain name (e.g. `www.hostname.com`).  Instead, it starts with Root DNS servers and then recursively asks authoritative DNS servers for each part of the domain name (e.g. `com`, then `hostname.com`).  Finally, it reaches the specific authoritative server which is responsible for the target domain name (e.g. `www.hostname.com`).  One such recursive DNS server is `unbound`.  You can read more information about it here: https://nlnetlabs.nl/projects/unbound/about/.
-
-AdGuard Home can use a built-in unbound DNS recursor on several system configurations (currently, Linux-amd64 and Linux-arm).
-
-
-## Enable recursive DNS server
-
-To enable recursive DNS server, add `unbound` to the "Upstream DNS servers" list in UI.
-If you want to use it for specific domains only, use `[/hostname/]unbound` setting.
-
-
-## Configure libunbound
-
-libunbound has many configuration settings that you can set in `AdGuardHome.yaml` file.  The list of supported settings is located here: https://nlnetlabs.nl/documentation/unbound/unbound.conf/
-
-For example, to set libunbound cache size equal to 8 megabytes, use this setting:
-
-	dns:
-	...
-	  unbound_settings:
-	  - 'msg-cache-size: 8m'