Updated API to point at the Pebble deep link

@abdyer please review.

This PR updates the API to point at the Pebble deep link `pebble://appstore/52bb09616437d1d079000110`. This PR can be merged into Master. This PR should not be merged into gh-pages until build 4 of the Pebble app is pushed live on the [Pebble store](https://dev-portal.getpebble.com/applications/52bb09616437d1d079000110).