Rename marconi to zaqar

Rename everywhere, sync template.rst with version in specs.

Adjust publishing URL, specs will show up on specs.openstack.org.

Create link to specs directory so that building works - like it's done
in other specs repositories.

Implements blueprint: project-rename
Change-Id: Ife866fafb9e1d94935bd0c02949e1cd9d5a9c281