Changing build task name

Renaming from 'dist' to 'build'. Also updating the .gitignore file to reflect
this change.
Adding copy task for built version

This will be the base to create a task to deploy to Github, pretty much like
Volo's gh-deploy.
Improving usability a little

First round of improvements include:

  - Enlarging the tiles dimensions
  - Reducing the number of sections from 11 to 5
  - Moving hint from footer to page body
Google Analytics tracking

Ditto