* Use image only when project has an image
So if there is no images, then projects can form a bit tigher and more
centered position in a square.
* Use same principle for all projects listing template
As per the review comment the listing of the projects would also be dependent on the existance of the image and creation of the space for it
This way it's much easier to tune the comment handling in general (like
disable it for some sections) or integrate a different commenting system
than disqus.
+ Add functionality to limit projects shown on main page
+ Improve projects display columns
+ List pages show content from _index.md files
+ Add GetPage logic to index.html and nav menus
