Remove the theme (incompatible license)

Leave my two files alone.
theme: Move css/ and js/ into the theme (they're not content)
theme/templates: Move _base.html into the theme
pelicanconf.py: Remove direct templates until they are available
theme/templates: Use the old blog template for articles
theme/templates: Add page.html and adjust to Pelican
content/blog/index.html: Fix 'post.url}}' -> '{{post.url}}' typo