Document Static widget

docs/examples/widgets/static.py

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+from textual.app import App, ComposeResult
+from textual.widgets import Static
+
+
+class StaticApp(App):
+    def compose(self) -> ComposeResult:
+        yield Static("Hello, world!")
+
+
+if __name__ == "__main__":
+    app = StaticApp()
+    app.run()