chore: add extend documentation

docs/content/extend/extend-traefik.md

@@ -0,0 +1,56 @@
+---
+title: Extend Traefik
+description: Extend Traefik with custom plugins using Yaegi and WebAssembly.
+---
+
+# Extend Traefik
+
+Plugins are a powerful feature for extending Traefik with custom features and behaviors. The [Plugin Catalog](https://plugins.traefik.io/) is a software-as-a-service (SaaS) platform that provides an exhaustive list of the existing plugins.
+
+??? note "Plugin Catalog Access"
+    You can reach the [Plugin Catalog](https://plugins.traefik.io/) from the Traefik Dashboard using the `Plugins` menu entry.
+
+## Add a new plugin to a Traefik instance
+
+To add a new plugin to a Traefik instance, you must change that instance's install (static) configuration. Each plugin's **Install** section provides an install (static) configuration example. Many plugins have their own section in the Traefik routing (dynamic) configuration.
+
+!!! danger "Experimental Features"
+    Plugins can change the behavior of Traefik in unforeseen ways. Exercise caution when adding new plugins to production Traefik instances.
+
+To learn more about how to add a new plugin to a Traefik instance, please refer to the [developer documentation](https://plugins.traefik.io/install).
+
+## Plugin Systems
+
+Traefik supports two different plugin systems, each designed for different use cases and developer preferences.
+
+### Yaegi Plugin System
+
+Traefik [Yaegi](https://github.com/traefik/yaegi) plugins are developed using the Go language. It is essentially a Go package. Unlike pre-compiled plugins, Yaegi plugins are executed on the fly by Yaegi, a Go interpreter embedded in Traefik.
+
+This approach eliminates the need for compilation and a complex toolchain, making plugin development as straightforward as creating web browser extensions. Yaegi plugins support both middleware and provider functionality.
+
+#### Key characteristics
+
+- Written in Go language
+- No compilation required
+- Executed by embedded interpreter
+- Supports full Go feature set
+- Hot-reloadable during development
+
+### WebAssembly (WASM) Plugin System
+
+Traefik WASM plugins can be developed using any language that compiles to WebAssembly (WASM). This method is based on [http-wasm](https://http-wasm.io/).
+
+WASM plugins compile to portable binary modules that execute with near-native performance while maintaining security isolation.
+
+#### Key characteristics
+
+- Multi-language support (Go, Rust, C++, etc.)
+- Compiled to WebAssembly binary
+- Near-native performance
+- Strong security isolation
+- Currently supports middleware only
+
+## Build Your Own Plugins
+
+Traefik users can create their own plugins and share them with the community using the [Plugin Catalog](https://plugins.traefik.io/). To learn more about Traefik plugin creation, please refer to the [developer documentation](https://plugins.traefik.io/create).

docs/mkdocs.yml

@@ -87,6 +87,7 @@ nav:
       - 'Logs & Access Logs': 'observe/logs-and-access-logs.md'
       - 'Metrics': 'observe/metrics.md'
       - 'Tracing': 'observe/tracing.md'
+  - 'Extend': 'extend/extend-traefik.md'
   - 'Configuration Discovery':
       - 'Overview': 'providers/overview.md'
       - 'Docker': 'providers/docker.md'