Cleaning up markup

- _Fixed_ some indentation issues
- Added a bit of CSS to the `head` to test some things
  - Added webfont Open Sans
  - Moved second part of heading to new line
  - Used `.wrapper` to make a ...wrapper (700 pixels wide)
  - Using CSS borders instead of `hr` to do the visual separation from header and content

Merge the changes and we can have a look at what we want to change next. This is the first step.