Replicate the 'Homepage' view from the Open Prices web app as a top level settings item

[teolemon]

What

• Replicate the 'Homepage' view from the Open Prices mobile app. Let's make the Open Prices home a top level settings item until we revamp the settings section.
• https://prices.openfoodfacts.org/app/ (with buttons to Single, Multiple price, Receipt addition)

Code pointers

• https://github.com/openfoodfacts/open-prices-frontend/blob/master/src/views/Home.vue

Mockups

Part of

• Open Prices (tracker) #5072