normalize: bigger h2, the previous size didn't fit well between h1 and h3 with the font I use.
Use Source Sans Pro as default font, and adjust weights.
Adjust some colors, remove `pre` border.
Adjust `page-main` p margins for cleaner visual.
French typographic fixes (nbsp).
Sidebar re-organization.
Article Meta on one line.
Implementation of *active* attribute in special templates.
Implement the #page-{slug} feature in page template.
Home page specific CSS, thanks to #page-{slug} feature.