Add styling to the index and layout views.

- Add Google Font (Cabin) include in layout view.
- Add new CSS stylesheet for Steps project.
- Add wrap on the body to center content.
- Add header and wrap element to center text and add margins.
Add high/low statistics over the past 14 days.

- Get the high/low steps and date while building the chart data.
- Set the key/value in redis.
- Get the high/low values from redis in / route.
- Add statistics div element with values.