dependencies on debian systems
Update LESS script (`1.0.32` → `1.3.3`)
Minor tweaks

Mostly readability tweaks.  Also a few minor style tweaks.
Made `index.html` X/HTML5 polyglot

Minor edits overall.  But, these changes make the document valid HTML5 **AND** valid XHTML5.

Validation as checked by http://validator.nu (using validation XHTML5 filter)

**BONUS:** “Fork me on GitHub” `img` fixed! :D