Create a playground for slides.

[kirjs]

This is part of #57
We need some space where we could experiment with different approaches for inlining slides.

First thing I would try:

1. Using https://github.com/gnab/remark
2. Something for the diagrams

TODO:

• Recreate these slides in the exercises folder.

[kirjs]

https://github.com/kirjs/ng2-codelab/blob/master/src/app/app-routing.module.ts

[kirjs]

Things to investigate besides what's in the slides:

• interactive examples/Demos (code + result)
• Displaying expected app result in a browser frame (kind of like in the pic below)