chore: theme docs

packages/docs/docs/overview/getStarted/theme.mdx

@@ -6,7 +6,7 @@ title: Theme
 
 
 import { CSSVariablesTable, ThemeTable } from '@site/src/components/cssVariables';
-
+import { DocRef } from '@site/src/components/ui/reference/docRef';
 
 Dockview components accept a `theme` property which is highly customizable, the theme is largly controlled through CSS however some properties can only be adjusted
 by direct editing variables of the `theme` object.
@@ -55,6 +55,13 @@ const {className} = themeAbyss;
 The source code for all themes can be found [here](https://github.com/mathuo/dockview/blob/master/packages/dockview-core/src/theme.scss) and the associated CSS [here](https://github.com/mathuo/dockview/blob/master/packages/dockview-core/src/theme.scss).
 :::
 
+## Build your own theme
+
+You can define your own `DockviewTheme` object and pass it to the `theme` property.
+
+<DocRef declaration="DockviewTheme" />
+
+
 ## Customizing Theme
 
 The provided themes are controlled primarily through a long list of CSS variables which can be modified by the user either entirely for a new theme