docs and refactor

docs/widgets/markdown.md

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+# Markdown
+
+A widget to display a Markdown document.
+
+- [x] Focusable
+- [ ] Container
+
+
+!!! tip
+
+    See [MarkdownViewer](./markdown_viewer.md) for a widget that adds additional features such as a Table of Contents.
+
+## Example
+
+The following example displays Markdown from a string.
+
+=== "Output"
+
+    ```{.textual path="docs/examples/widgets/markdown.py"}
+    ```
+
+=== "markdown.py"
+
+    ~~~python
+    --8<-- "docs/examples/widgets/markdown.py"
+    ~~~
+
+## Messages
+
+### ::: textual.widgets.Markdown.TOCUpdated
+
+### ::: textual.widgets.Markdown.TOCSelected
+
+### ::: textual.widgets.Markdown.LinkClicked
+
+
+## See Also
+
+* [Markdown][textual.widgets.Markdown] code reference
+* [MarkdownViewer][textual.widgets.MarkdownViewer] code reference

docs/widgets/markdown_viewer.md

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+# Markdown Viewer
+
+A Widget to display Markdown content with an optional Table of Contents.
+
+- [x] Focusable
+- [ ] Container
+
+!!! note
+
+    This Widget adds browser-like functionality on top of the [Markdown](./markdown.md) widget.
+
+
+## Example
+
+The following example displays Markdown from a string and a Table of Contents.
+
+=== "Output"
+
+    ```{.textual path="docs/examples/widgets/markdown_viewer.py" columns="100" lines="42"}
+    ```
+
+=== "markdown.py"
+
+    ~~~python
+    --8<-- "docs/examples/widgets/markdown_viewer.py"
+    ~~~
+
+## Reactive Attributes
+
+| Name       | Type | Default | Description                                                       |
+| ---------- | ---- | ------- | ----------------------------------------------------------------- |
+| `show_toc` | bool | True    | Wether a Table of Contents should be displayed with the Markdown. |
+
+## See Also
+
+* [MarkdownViewer][textual.widgets.MarkdownViewer] code reference
+* [Markdown][textual.widgets.Markdown] code reference