Add pages for all links rules.

docs/styles/links/index.md

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+# Links
+
+Textual supports the concept of inline "links" embedded in text which trigger an action when pressed.
+
+There are a number of styles which influence the appearance of these links within a widget.
+
+| Property                | Description                                                 |
+|-------------------------|-------------------------------------------------------------|
+| `link-color`            | The color of link text.                                     |
+| `link-background`       | The background color of link text.                          |
+| `link-style`            | The style of link text (e.g. underline).                    |
+| `link-hover-color`      | The color of link text with the cursor above it.            |
+| `link-hover-background` | The background color of link text with the cursor above it. |
+| `link-hover-style`      | The style of link text with the cursor above it.            |
+
+## Syntax
+
+```scss
+link-color: <COLOR>;
+link-background: <COLOR>;
+link-style: <TEXT STYLE> ...;
+link-hover-color: <COLOR>;
+link-hover-background: <COLOR>;
+link-hover-style: <TEXT STYLE> ...;
+```
+
+## Example
+
+In the example below, the first `Static` illustrates default link styling.
+The second `Static` uses CSS to customize the link color, background, and style.
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/links.py"}
+    ```
+
+=== "links.py"
+
+    ```python
+    --8<-- "docs/examples/styles/links.py"
+    ```
+
+=== "links.css"
+
+    ```sass
+    --8<-- "docs/examples/styles/links.css"
+    ```
+
+## Additional Notes
+
+* Inline links are not widgets, and thus cannot be focused.
+
+## See Also
+
+* An [introduction to links](../guide/actions.md#links) in the Actions guide.
+
+[//]: # (TODO: Links are documented twice in the guide, and one will likely be removed. Check the link above still works after that.)