Added main menu

Added menu items linking to:
  /
  /Pages
  /Pages/About
  /Projects

and added the above pages/placeholders.

Will fill out pages. Add resume somewhere (pdfreader/embedded/link to pdf) and link it from /Pages/About/
Will work on /Projects and YAML categories. Should be auto populated.

Will manually edit /Pages so I don't put things there that aren't ready to publish.