[Docs Site] Restore larger content width when ToC is disabled (#19732)

Author: KianNH

src/components/overrides/Page.astro

@@ -62,3 +62,9 @@ if (data.updated) {
 ---
 
 <Default {...Astro.props} set:html={html} />
+
+<style>
+	html:not([data-has-toc]) {
+		--sl-content-width: 67.5rem;
+	}
+</style>