Update the community settings documentation

[qstokkink]

The documentation still encourages the old lengthy and error-prone way of passing community settings to Community instances.

py-ipv8/doc/reference/community_best_practices.rst

Lines 114 to 128 in 505b2cd

	class MyCommunity(Community):
	def __init__(self, *args, **kwargs):
	# Create-if-Missing Pattern
	settings = kwargs.pop('settings', MyCommunitySettings())
	if isinstance(settings, dict):
	# Convert user dict to settings object
	settings = MyCommunitySettings.from_dict(settings)
	# Create-if-Missing Pattern
	self.value_manager = kwargs.pop('value_manager',
	ValueManager(settings.value_manager))
	super().__init(*args, **kwargs)

This has recently been formalized and should be replaced with:

class MyCommunitySettings(CommunitySettings):
    value_manager: ValueManager | None = None

class MyCommunity(Community):
    settings_class = MyCommunitySettings

    def __init__(self, settings: MyCommunitySettings) -> None:
        super().__init__(settings)
        self.value_manager = settings.value_manager or ValueManager()