Changes to layout

Various changes were made:
  - The background texture is now "husk", while "mooning" was added as a
    second option for the future.
  - Decreased the width of the central container. I'll probably decrease
    it even further in the future, when I remove the sidebar in favor of
    upper links (a global navigation bar, maybe).
  - Centered the blog's title. (I really should think about a subtitle
    not involving japanese...)
  - Added a color palette to variables.less, which isn't used at the
    moment. It's for future use.
  - Removed logos, as now I'm using fontawesome's icons.