Update site description to match homepage header

Author: Peter O'Shaughnessy

_config.yml

@@ -2,7 +2,7 @@
 title: pebble {code}
 email: [email protected]
 description: > # this means to ignore newlines until "baseurl:"
-  pebble {code} enable organisations to make the most of modern technologies, data & people through innovation strategy consulting, hacking, rapid prototyping, human-centred design, Agile delivery & measurement.
+  pebble {code} - Technology Innovation Consultancy - Design Thinking, Rapid Prototyping and Agile Software Development
 baseurl: "" # the subpath of your site, e.g. /blog/
 url: "http://pebblecode.com" # the base hostname & protocol for your site
 twitter: pebblecode