Update plugins.mdx Starlight Fullview Mode (#3037)

Author: windmillcode0

docs/src/content/docs/resources/plugins.mdx

@@ -197,4 +197,10 @@ These community tools and integrations can be used to add features to your Starl
 		title="starlight-to-pdf"
 		description="A CLI tool to convert Starlight websites into PDF files."
 	/>
+	<LinkCard
+		href="https://github.com/WindMillCode/starlight-fullview-mode"
+		title="starlight-fullview-mode"
+		description="Collapse sidebars and expand content for a fullscreen experience."
+	/>
+
 </CardGrid>