feat: simplify theme config

[anxolin]

Summary

This PR is just a proposal. I like it more, but I want to get the temperature of the squad.

I feel that in order to control the theme, is easier if we just have a single theme parameter.

In this PR I propose to:

• 🔪 kill palette parameter
• 🤩 Enhance theme to allow more control

Basically you would use it like this:

// Dark theme
{ theme: 'dark' }

// Light theme
{ theme: 'light' }

// Full control, based on a theme, you override some colors
{
theme: {
        baseTheme: 'light',
        primaryColor: '#d9258e',
        screenBackground: '#ee00cd',
        widgetBackground: '#b900ff',
        textColor: '#b348cc',
   }
}

Test

it should work as before, its just, we don't have 2 properties. Just one theme

You can uncomment this to see the new colors: https://github.com/cowprotocol/cowswap/blob/simplify-theme/apps/widget-configurator/src/app/configurator/hooks/useWidgetParamsAndSettings.ts#L45

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[shoom3301]

That is really simple and laconic!