Reorganize Example Folders

[briancain]

Is your feature request related to a problem? Please describe.

Making the waypoint-examples repo easier to digest for people, and include more complex examples that show off new features of Waypoint.

Describe the example scenario you wish to be included

For basic examples simply showing off Waypoint at the platform, we could have those groups under a platforms folder.
Then for more advanced features like config syncing with vault, or #52 a rails server with db migrations, we can have a features folder to show off more complicated examples.

Describe the solution you'd like

See above.

[briancain]

I'm going to close this for now. I think we've been sticking feature-specific examples inside platform folders with names like language_waypointfeature. That's probably okay for now.