Copy static pages.

Signed-off-by: Weland Treebark <weland@blinkenshell.org>
Generate index page.

Added magic to generate an index.html page. This is based on a template
in base/, the centerpiece of which is the bb:index tag, which generates
a special snippet containing an overview (the chapeau) of the latest blog
post.

Signed-off-by: Weland Treebark <weland@blinkenshell.org>
Refactored messy default files generation.

Signed-off-by: Weland Treebark <weland@blinkenshell.org>