Replace `YellowAdaptive` anon function with a basic `lipgloss.NewStyle()`

[digitalghost-dev]

Currently, there is an anonymous function called YellowAdapative in styling.go that is used in the speed command to adapt the color depending on light or dark mode the user has in their terminal.

This can be removed and replaced with:

Yellow = lipgloss.NewStyle().Foreground(lipgloss.AdaptiveColor{Light: "#E1AD01", Dark: "#FFDE00"})

Then, used with the lipgloss .Render() method instead like:

styling.Yellow.Render(pokemon.SpeedEV),