Update config documentation

[Derranion]

• Update config docs for components.all
• Add Presets feature docs

Description:
We need to update config docs for 1.5.0 version because we made two big things there:

1. Added new feature - Feat #1806: Presets for all components & components config structure change.
2. Made the breaking change by moving componentsAll feature to components.all and componentsPresets to components.presets.
   (More info is here Move componentsAll config and presets into components option #1967)

To help you with that here is the current config structure:

{
  components: {
    all: { ... },
    presets: { ... },
  },
  colors: { ... },
  icons: { ... },
}

Previous structure:

{
  components: { ... },
  componentsAll: { ... },
  componentsPresets: { .. },
  colors: { ... },
  icons: { ... },
}

Tips:
To add components.all docs just rename \ correct this in the docs.

To add Presets docs you could use VaConfig.demo -> Presets as an example, in the 1.5.0 branch.
Also it is possible to use Presets with VaConfig component (local config).

Side note:
You could do this in the end of the 1.5.0 Milestone because there is a chance that I'll add this during free time.

[asvae]

Can we check if all requirements are met in current state and close this? @aluarius

[aluarius]

Can we check if all requirements are met in current state and close this?

@asva No, current state must be reworked. I'll deal with it today.