Removes trailing spaces.
Renames to map-bg for consistency.
Little clean ups.

- Renamed #portfolioModal to #post.
- Wrote an actual _layout/default template (uses {{ content }}).
- Fixed index to use the new layout.
- Removes layout from the post since it opens as a modal.
Rearranges the style inclusions to avoid confusion.
Removes execution access to stylesheet.
Removes yet another level of indirection.

Now the resources are organized more cleanly:
- _includes: only has html partials.
- _layouts: has only used layouts.
- css: has all css files.
- img: has all img files.
- js: has all javascript files.