[wip] Fixes #237 - playing around with the design, using logo

[benichu]

This PR is a playground where I experiment with a new design.
I initially started this because of the current "logo" (or lack off) and it moved to more of general experimentation of the visual layout of the information that montreal.rb might want to put forward...

I also tried to keep the "design" in sync with the official new http://rubyonrails.org/ website.

DISCLAIMER: I am a not a designer by trade.

Proposed Design (Work In Progress)

Current Design (June 7th 2016)

Notes

• I removed the "news" sidebar, because I thought that the information displayed there added no value whatsoever, we should keep the "news" section separate and make it work as the web archive of email we would regularly send to our members through mailchimp
• I tried to add a "jumbotron" describing what we are and why our organization might be interesting for the visitor, this section could also serve as a call to action zone
• The text I added is mumbo-jumbo and would need to be discussed/written properly
• The logo is the one I found in the project's assets

Make Ruby Great Again

[houndci-bot]

Selector should have depth of applicability no greater than 2, but was 3

[coveralls]

Coverage remained the same at 100.0% when pulling 03d2469 on bt-237-better-header-logo into 865fbce on master.

[coveralls]

Coverage remained the same at 99.839% when pulling 7e41c16 on bt-237-better-header-logo into db9f9a4 on master.

[sophiedeziel]

Closing because it's getting way out of date with master