updating index to promote auth/stitch tut

Author: skerschb

source/index.txt

@@ -11,7 +11,7 @@ Guides
 
    server/introduction
    server/install
-   stitch/react_googleauth
+   server/auth
    MongoDB in the Cloud
      cloud/atlas
      cloud/connectionstring 
@@ -28,5 +28,4 @@ Guides
      server/read_operators
      server/update
      server/delete
-   Advanced Queries in MongoDB: Slice and Dice Your Data
-     server/match_sort
+   stitch/react_googleauth