Parts 1 & 2 of the beginner tutorial must be adapted to the new project structure (with `app/Resources`, `src/AppBundle`).

It should include an introduction of the project structure, with links to the Sf and Platform documentations. It should also present each concept when it is introduced.

Focus should be put on the user's journey. Ideally, each step would be visible as early as possible. This is satisfying for the user, and avoids burying errors under more code.

What will be delivered :
-> Introduction with storytelling on the Beginner Tutorial : why rides
-> Step 1 : Installation, Content Type creation (Ride), Layout templating
-> Step 2 : Ride templating, Adding Content, Content Type Creation (Points Of Interest), Edit Content Type (adding Relation with Points Of Interest), POI templating, Ride templating with POI
-> Step 3 : Adding features, Adding multi-language