Update the landing page with the new branding

Make the unauthenticated landing page fall in line with the rest of the Exercism branding and update it to use the new styles.

Takes care of #1677 and was a lot of fun. :smiley:


:+1:

On Mon, Sep 15, 2014 at 10:52 PM, Katrina Owen <notifications@github.com>
wrote:

>> @@ -3,10 +3,10 @@
>>      .home-top
>>        %div.container
>>          %section.contain-centered
>> -          %h1.home-top-header exercism.io
>> -          %h2.home-top-subheader The devil is in the details
>> -          %p.lead.home Crowd-sourced mentorship. Public prototype.
>> -          %a.btn.btn-large.btn-success.home{href: '/login'} Start Now (via GitHub)
>> +          %img.logo{src: link_to("/icons/logo.svg")}
>> +          %h2.home-top-header The Devil Is In The Details
> FYI - I'm changing the tagline to be tagline-cased instead of title-cased :)
> ---
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> https://github.com/exercism/exercism.io/pull/1731/files#r17582139