Deprecate http://railsbridge.org/about/chapters in favor of Bridge Troll API pulls

[lilliealbert]

We're not really keeping http://railsbridge.org/about/chapters up to date, and Bridge Troll has an actual database of chapters. What if we got rid of the hard-coded chapters page and pulled the chapters from a Bridge Troll API?

We'd need to add the following to chapters:

• Website URL
• Mailing list URL
• Twitter handle

Here's the issue for making the API: railsbridge/bridge_troll#489