Update wiki

Author: tomfran

wiki/features/hooks.md wiki/features/advanced-customization.mdwiki/features/hooks.md renamed to wiki/features/advanced-customization.md

@@ -1,15 +1,34 @@
 ---
-title: "Hooks"
-date: "2024-10-06"
-summary: "Layout hooks"
-description: "Layout hooks"
+title: "Advanced Customization"
+date: "2024-10-07"
+summary: "Advanced customization options"
+description: "Advanced customization options"
 toc: false
 readTime: false
 autonumber: true
 math: false
 showTags: false
+hideBackToTop: true
 ---
 
+## Custom CSS
+
+The theme supports custom css, you can override anything you want by redefining classes in the `assets/css/custom.css` file.
+
+For instance, changing the main width can be done as follows: 
+
+```css
+:root {
+    --main-width: 1024px; /* overrides default of 780px */
+}
+```
+
+Note that backward incompatible changes in the CSS will likely not happen, but there might be cases in the future where 
+backward compatibility is not possible. If you are overriding a huge amount of CSS I suggest you forking the project instead of 
+defining it here.
+
+## Hooks
+
 Hooks allow to customize layouts by injecting custom code at specific points in the layout.
 Hooks are defined in the `layouts/partials/hooks` directory.
 The following hooks are currently available: