Add SearXNG page

src/content/docs/Services/searxng.mdx

@@ -0,0 +1,13 @@
+---
+title: SearXNG
+---
+
+### Summary
+
+SearXNG lets you perform fast, privacy-focused searches across the web—completely free from tracking, profiling, or intrusive advertising. SearXNG works by aggregating results from many different search engines (you can configure which ones it queries) into one page. You can find SearXNG hosted at https://search.federated.nexus.
+![A search for "Federated Nexus" on SearXNG, showing results with links, favicons, and descriptions](../../../images/searxng/search.png)
+
+### Settings
+
+SearXNG is very customizable, there are many settings you can customize, including what search engines to query, the UI theme, and more.
+![SearXNG settings page, showing many different tabs of settings](../../../images/searxng/settings.png)

src/content/docs/index.mdx

@@ -38,7 +38,7 @@ import { CardGrid, Card } from "@astrojs/starlight/components"
         We run a [SearXNG](https://searxng.org) instance that allows you to log
         in using your Federated Nexus account and perform fast, privacy-focused
         searches across the web—completely free from tracking, profiling, or
-        intrusive advertising.
+        intrusive advertising. [Learn More...](/services/searxng)
     </Card>
     <Card title="A Fast and Free Home for Your Code" icon="seti:git">
         We host a free instance of [Forgejo](https://forgejo.org) at