fix getting-started

Author: LadyBluenotes

src/routes/(getting-started)/data.json

@@ -1,4 +1,9 @@
 {
 	"title": "Getting Started",
-	"pages": ["quick-start.mdx", "counter.mdx", "todo.mdx"]
+	"pages": [
+		"installation.mdx",
+		"quick-start.mdx",
+		"todo.mdx",
+		"understanding-jsx.mdx"
+	]
 }