Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/methods/site/IsServer.md

@@ -0,0 +1,21 @@
+---
+title: IsServer
+description: Reports whether the built-in development server is running.
+categories: []
+keywords: []
+action:
+  related: []
+  returnType: bool
+  signatures: [SITE.IsServer]
+expiryDate: 2024-10-30 # deprecated 2023-10-30
+---
+
+{{% deprecated-in 0.120.0 %}}
+Use [`hugo.IsServer`] instead.
+
+[`hugo.IsServer`]: /functions/hugo/isserver
+{{% /deprecated-in %}}
+
+```go-html-template
+{{ .Site.IsServer }} → true/false
+```