index.md: use template

Change-Id: I2dc158b945e6588090f5b56677464e1921be2f8d
diff --git a/index.md b/index.md
index 0d1f5f6..b3fceab 100644
--- a/index.md
+++ b/index.md
@@ -1,5 +1,6 @@
 ---
 title: Index
+template: true
 ---
 
 <div id="wikiindex">