Refactor docs

mkdocs-website/docs/en/development/changes_plugins.md

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+## Plugins
+
+Plugins are a way to extend the functionality of your Wails application.
+
+### Creating a plugin
+
+Plugins are standard Go structure that adhere to the following interface:
+
+```go
+type Plugin interface {
+    Name() string
+    Init(*application.App) error
+    Shutdown()
+    CallableByJS() []string
+    InjectJS() string
+}
+```
+
+The `Name()` method returns the name of the plugin. This is used for logging
+purposes.
+
+The `Init(*application.App) error` method is called when the plugin is loaded.
+The `*application.App` parameter is the application that the plugin is being
+loaded into. Any errors will prevent the application from starting.
+
+The `Shutdown()` method is called when the application is shutting down.
+
+The `CallableByJS()` method returns a list of exported functions that can be
+called from the frontend. These method names must exactly match the names of the
+methods exported by the plugin.
+
+The `InjectJS()` method returns JavaScript that should be injected into all
+windows as they are created. This is useful for adding custom JavaScript
+functions that complement the plugin.