src/app/dashboards/azure.json: Remove our local filter row

Newer versions of Kibana have Query and Filtering rows built into the
title-bar [1], so we don't need to code them into our dashboard
locally.

[1]: http://www.elasticsearch.org/blog/kibana-3-milestone-4/
src/app/dashboards/azure.json: Split table and search text into its own row

This gives more space for the Document Types and Terms panels, which
is good because the Document Types panel is currently giving me:

  Could not draw pie with labels contained inside canvas

Maybe I just have a small browser window ;).  Still, the text
explanation is fairly long, and would benefit from having more space
available.  I also reworded the intro slightly, and used 'title' to
set the title.