site_title configuration variable which is used in template

[rgrp]

As a sysadmin I want to configure basic site title information for use in the site templates.

Implementation:

• site_title config variable
• use in head title and in main site title/logo section
• Also all other pages (e.g. index, about) which talk about CKAN
  • Is this needed? Would it not be better for people who want to customize the site to simply overwrite those templates?

Questions:

• Do we want a site_logo variable whic his use for site title/logo section instead of site_title if site_logo defined?