Links to user and dev docs on Fuel Overview LP page are outdated

[Olena Logvinova]

The Overview LP Fuel page contains the outdated info:

https://launchpad.net/fuel

Users Documentation: http://docs.mirantis.com/openstack/fuel/master/ built from https://github.com/stackforge/fuel-docs.
Development documentation: http://docs.mirantis.com/fuel-dev/.

Now both user and dev docs are located at http://docs.openstack.org/developer/fuel-docs/ (repo: https://github.com/openstack/fuel-docs).

Thanks for updating the page.

[Igor Shishkin (teran)]

Assigning to proper team.