Wrap the no posts message & add heading

Applies the a div with a `wrap` class around the content so its margins and padding is inline with the design.
Added robots.txt to .gitignore
Merge pull request #597 from f3ndot/patch-2

Fix the padding/margin of the message displayed when no posts are written
Merge pull request #601 from acarbonaro/master

Added robots.txt to .gitignore