Revamp UI and responsiveness

[comzeradd]

• Make better use of grid css classes
• Collapse navbar to a hamburger button for mobile
• Fix responsivness issues
• Removed unused html/css code
• Switch to Fira Sans
• Add basic branding graphics
• Add License
• Fixes Align Design with New Clubs Site #58
• Fixes Site Issues in Responsive Mode #57

[comzeradd]

@nukeador can you test it locally before we merge?

[nukeador]

• breadcumbs class is now too small
• Social icons to share don't have now a place to "hang from" since we removed the container side border
• Localized pages need class update too
• I'm not sure about this blue/purple colour for header, links. It's not very mozilla to me.

Cheers.

[comzeradd]

Thanks. I hadn't touch the subpages yet. I just amended the commit to address these issues.

Regarding the header, I followed the color scheme of the branding graphics created for the stickers & t-shirts.

[nukeador]

If we want a dark blue colour we should check the sandstone palette

https://www.mozilla.org/en-US/styleguide/websites/sandstone/colors/

[nukeador]

I think #3F4B73 is way nicer for the dark blue

nightly-blue darkener 15% from https://mozilla.github.io/mofo-bootstrap/demo/

[comzeradd]

A screenshot with the #3F4B73 version

[nukeador]

I still see this PR using the old colours. The rest seems to be fixed.

[comzeradd]

I just amended the commit with the new colors.

[nukeador]

Great work, look awesome, it's good to merge.

Question: I don really get what the favicon is :P

[comzeradd]

It's the rocket logo from the stickers design. But indeed it doesn't look that small. I reverted and we can revisit later.

[brianking]

Since the checkin, many pages on the site are redirecting to the mozilla.github.io version if the site, e.g. FAQ.

[umeshagarwal]

Just wanted to add my one cent to this work..
The "FAQ ROADMAP PARTICIPATION" on the top is little overlapping and has some rendering issue.
It will be great if it looks more clear.
I just visited all major sub links and it looks great to me!!

[nukeador]

@brianking that should be fixed by f692ffe as soon as the cache is renewed