docs: Add short description in the root page

Add a short description of the program in the root page of the
documentation

README.md

@@ -4,12 +4,12 @@ snf-image-creator
 Overview
 --------
 
-This is snf-image-creator, a command line tool for creating OS Images to be
+This is snf-image-creator, a command-line tool for creating OS Images to be
 used with Synnefo.
 
 It comes in two variants:
 * snf-image-creator: A user-friendly dialog-based program
-* snf-mkimage: A non-interactive command line program
+* snf-mkimage: A non-interactive command-line program
 
 Project Page
 ------------

docs/index.rst

@@ -6,7 +6,12 @@
 Welcome to snf-image-creator's documentation!
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-snf-image-creator is an image creation tool for `Synnefo <https://code.grnet.gr/projects/synnefo>`_
+This is snf-image-creator, a command-line tool for creating OS Images to be
+used with `Synnefo <http://www.synnefo.org/>`_.
+
+It comes in two variants:
+ * snf-image-creator: A user-friendly dialog-based program
+ * snf-mkimage: A non-interactive command-line program
 
 Contents: