TE example with Pebble

[tomaszmichalak]

Is your feature request related to a problem? Please describe.
The current templating example use Handlebars. We should update the tutorial to use Handlebars and Pebble.

Describe the solution you'd like
Process the page containing two snippets:

• with Handlebars syntax
• with Pebble syntax

Please note that we can simply replace TE syntax without data changes.

Additional context

• move the example assets from https://github.com/Knotx/knotx-fragments#supply-fragments