Chapter selection updates

[shaun-technovation]

A pretty big refactoring that will create 8 different permutations of the chapter selection screen, for both students and mentors:

• Chapters found only in state/province
• Chapters found in state/province AND country
  • State/province chapters will be displayed by default
  • There will now be a button to display additional chapters in someone's country
• Chapters found only in the country
  • No chapters will be displayed, they will have to click a button to display additional chapters in their country
• No chapters found

And a few other updates:

• Add mentor mentoring options to no chapters available screen
• Update some of the text

[shaun-technovation]

@viviancan Something is up w/ CircleCI so the build is failing, anywho, I'm out tomorrow, but to keep things moving, if you wanted to code review or test this (I think there might be some kinks to work out still) feel free, if not, no worries! 😄