Implement the Guides on the homepage

[teolemon]

Implement the Guides on the homepage and in search

### Coordinate with the server to integrate the new guide (+News?) experience
- [ ] Define a backend to serve the guides (Wordpress-based ?
- [ ] We can use test-blog.openfoodfacts.org as a sandbox

### Implement the guides in the app
- [ ] Implement the guides as a section of the homepage
- [ ] Implement the guides as a suggestion in the new search experience

### Potential topics
- [ ] Nutri-Score
- [ ] Eco-Score
- [ ] Nutri-Score v2
- [ ] How to choose a mineral water
- [ ] Features
- [ ] Features - Prices
- [ ] Contribute
- [ ] Discover
- [ ] Values of Open Food Facts
- [ ] Searchable FAQ
- [ ] Cosmetics methodology / FAQ
- [ ] Pet food methodology / FAQ
- [ ] Our independance from the food industry
- [ ] How we're funded
- [ ] What does the "Open" in Open Food Facts mean ?
- [ ] Newsletter subscription (with an option to create an account)
- [ ] PNNS
- [ ] Nutrients

Mockups

Part of

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• 4847

[teolemon]

There are a number of Wordpress packages. I suggest we start by implementing a native version of the Open Food Facts blog before moving to guides. https://pub.dev/packages?q=wordpress

(This one looks slightly nicer in terms of README) https://pub.dev/packages/wordpress_rest_api