Integrate the NutriScore v2 guide

[g123k]

Hi everyone,

Here are the changes we will do to integrate the NutriScore v2 guide:

### Tasks
- [ ] Create a Changelog-like mechanism that displays a screen (if available) to explain new features
- [ ] For existing users, this screen will be displayed in fullscreen the first time the app is launched
- [ ] For new users, this screen is never opened in fullscreen automatically
- [ ] For new users, we add a dismissible button in the main/first card of the carousel to open this screen
- [ ] Design (and implement) a screen for this "changelog" for NutriScore v2
- [ ] Enable the mechanism starting the 6th of June
- [ ] Add Analytics events

Also:

• [ ] Implement the Share button in the NutriScore V2 guide

[teolemon]

looks good, an analytics events to count how many people saw it ?

[g123k]

We should have an event when the screen is opened