about -> index (tolta la dedica)

content/pages/about.en.rst

@@ -1,7 +1,7 @@
 About
 ###################
 
-:slug: about
+:slug: index
 :navbar_sort: 1
 :lang: en
 

content/pages/about.rst

@@ -1,8 +1,8 @@
 About
 ###################
 
-:save_as: about.html
-:slug: about
+:save_as: index.html
+:slug: index
 :navbar_sort: 1
 
 L'hackmeeting del 2016 si terrà a Pisa da venerdì 3 a domenica 5 giugno.