Adding bootstrap based template.

For the most part, it is completely responsive. There may be some parts
where it doesn't quite work out, and my hope is that this can get worked
on into the future. There is some javascript, but the webiste will be
just as usable without javascript enabled.
Merge pull request #25 from pserwylo/feature/bootstrap

Adding bootstrap based template.
Adding pointer on item's collapse button
README update
HTML5 validation
Adding cursor: pointer on article titles