Add Pi-hole (#1314)

Signed-off-by: Daniel Gray <dng@disroot.org>

docs/assets/img/dns/pi-hole.svg

@@ -0,0 +1 @@
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docs/dns.en.md

@@ -125,4 +125,22 @@ Encrypted DNS proxy software provides a local proxy for the [unencrypted DNS](ba
         - [:fontawesome-brands-linux: Linux](https://github.com/DNSCrypt/dnscrypt-proxy/wiki/Installation-linux)
         - [:fontawesome-brands-github: Source](https://github.com/DNSCrypt/dnscrypt-proxy)
 
+## Self-hosted Solutions
+
+### Pi-hole
+
+!!! recommendation
+
+    ![Pi-hole logo](assets/img/dns/pi-hole.svg){ align=right }
+
+    **Pi-hole** is an open-source [DNS-sinkhole](https://wikipedia.org/wiki/DNS_sinkhole) which uses [DNS filtering](https://www.cloudflare.com/learning/access-management/what-is-dns-filtering/) to block unwanted web content, such as advertisements.
+
+    Pi-hole is designed to be hosted on a Raspberry Pi, but it is not limited to such hardware. The software features a friendly web interface to view insights and manage blocked content.
+
+    [Website](https://pi-hole.net/){ .md-button .md-button--primary } [Privacy Policy](https://pi-hole.net/privacy/){ .md-button }
+
+    ??? downloads
+
+        - [:fontawesome-brands-github: Source](https://github.com/pi-hole/pi-hole)
+
 --8<-- "includes/abbreviations.en.md"

docs/tools.en.md

@@ -118,10 +118,34 @@ For your convenience, everything we recommend is listed below with a link to the
 
 ### DNS
 
+**DNS Providers:**
+
 We [recommend](dns.md#recommended-providers) a number of encrypted DNS servers based on a variety of criteria, such as [Mullvad](https://mullvad.net/en/help/dns-over-https-and-dns-over-tls) and [Quad9](https://quad9.net/) amongst others. We recommend for you to read our pages on DNS before choosing a provider. In many cases, using an alternative DNS provider is not recommended.
 
 [Learn more :material-arrow-right:](dns.md)
 
+**Encrypted DNS Proxies:**
+
+<div class="grid cards" markdown>
+
+- ![RethinkDNS logo](assets/img/android/rethinkdns.svg#only-light){ .twemoji }![RethinkDNS logo](assets/img/android/rethinkdns-dark.svg#only-dark){ .twemoji } [RethinkDNS](dns.md#rethinkdns)
+- ![DNSCloak logo](assets/img/ios/dnscloak.png){ .twemoji } [DNSCloak](dns.md#dnscloak)
+- ![dnscrypt-proxy logo](assets/img/dns/dnscrypt-proxy.svg){ .twemoji } [dnscrypt-proxy](dns.md#dnscrypt-proxy)
+
+</div>
+
+[Learn more :material-arrow-right:](dns.md#encrypted-dns-proxies)
+
+**Self-hosted Solutions:**
+
+<div class="grid cards" markdown>
+
+- ![Pi-hole logo](assets/img/dns/pi-hole.svg){ .twemoji } [Pi-hole](dns.md#pi-hole)
+
+</div>
+
+[Learn more :material-arrow-right:](dns.md#self-hosted-solutions)
+
 ### Email
 
 <div class="grid cards" markdown>