Start implementation of general settings

[0xbaggi]

As suggested in #70, I added a new section (general setting) in the page settings, which will have general settings like light/dark mode and currency selector. I haven't started to implement the page because it hasn't been defined on Figma yet.

[theperu]

Hi @0xbaggi ! Since I haven't heard back from the guy who was working on #70 if you want you can start implementing that part in the general settings. Personally I wouldn't wait for the figma since this is a small part of the app and there shouldn't be many problems with it.
For the dark mode I remember that @napitek already tried something but we can implement it in the future.

[0xbaggi]

I added some static buttons in the general settings page, their functionalities have yet to be implemented.

• Appearance to enable/disable dark mode
• Currency to select your preferred currency
• Language to select the app’s default language

Screen_recording_20230913_232758.webm

[theperu]

Hi I would remove the language picker (or we can keep the code and just avoid displaying it) for now since we won't support other languages before version 1.0.
I see that the check failed with this message:

The current Dart SDK version is 2.18.0.
Because sossoldi depends on country_flags >=2.1.0 which requires SDK version >=3.0.0 <4.0.0, version solving failed.

We should probably look into that, we might think about using the emojis for the flags (Ex. 🇮🇹, 🇬🇧, 🇩🇪, 🇫🇷) instead of something external.

[0xbaggi]

I removed the library, replaced the flags with the relative emojis and hid the language setting for future versions.
The hidden part is made with emoji without the library(not currently visible because commented):

[theperu]

Looks good and the check passed, @mikev-cw if you are ok with that I think we can merge this

[mikev-cw]

@theperu if you already checked, it's enough. Let's merge!