Merge pull request #137 from LauraHilliger/gh-pages

Added example btn to homepage, rearranged find help
Merge pull request #138 from LauraHilliger/gh-pages

adjusted lineheight, bottom navigation and participation graphic
Merge pull request #140 from LauraHilliger/gh-pages

used quote from OER definition from Hewlett
Merge pull request #141 from LauraHilliger/gh-pages

reduced jumbotron box size by half
changed social hype to follow along