fix single page menu urls, update example sites #151

exampleSite/content/about.md

@@ -2,22 +2,22 @@
 title: "About"
 description: "Hugo, the world’s fastest framework for building websites"
 date: "2019-02-28"
-aliases:
-  - "about-us"
-  - "about-hugo"
-  - "contact"
+aliases: ["about-us","about-hugo","contact"]
 author: "Hugo Authors"
 menu:
   about:
-    name: About
-    title: About
-    url: /about
+    identifier: about-subpage
+    parent: about
+    name: About Subpage
+    title: About Subpage
+    url: /about/subpage/
     weight: 1
   subpage:
+    identifier: about-subpage2
     parent: about
-    name: Subpage
-    title: Subpage
-    url: /about/subpage
+    name: Second About subpage
+    title: Second About subpage
+    url: /about/subpage2/
     weight: 10
 ---