Remove dead code
Group settings together
Add site-wide settings to config.rb

The following variables are used to define basic metadata
for this website:
- site_author
- site_title
- site_subtitle
- site_url

While these variables are used to provide integration with
some 3rd party services:
- analytics_id: Google Analytics
- disqus_shortname: Disqus comments

Some templates were updated to use these settings instead of
hardcoded values.
Change the default timezone to Europe/Rome
Reshuffle config.rb
Add livereload extension
Layout: improve page title