Allow easily moving between pages on http://building.gittip.com/

[Aaron1011]

Currently, there's no good way to move between different pages when you're reading http://building.gittip.com/.

For example, say I'm on the Brand Guidlines page. If I'm reading through the entire website, I'm want to go to Audience next, but there's no link on the Brand Guildlines page to do this.

I think the best thing to do is to have a button that says 'Next page', or possible the name of the next page, on each page of the website. This would make navigating between pages a lot easier.

[seanlinsley]

We actually have a separate repo and issue tracker for building.gittip.com. Moving this to gratipay/inside.gratipay.com#37