Fixing book.json to redirect to the installation guide, rather than the generic wiki homepage

Change-Id: If5abc92f2f606b743c34b80a0090ee6a4ac6830a
diff --git a/docs/book.json b/docs/book.json
index f685978..3b535c0 100644
--- a/docs/book.json
+++ b/docs/book.json
@@ -23,7 +23,7 @@
           "text": "4.0 (Stable)"
         },
         {
-          "value": "http://wiki.opencord.org/",
+          "value": "https://wiki.opencord.org/display/CORD/Building+and+Installing+CORD",
           "text": "3.0 and previous (wiki)"
         }
       ]