[FEATURE] Add page, collection, and blog optional attributes to render-engine init

[kjaymiller]

To make customizability and getting started easier for render-engine init, I propose we add the following parameters to render-engine init

def init(
pages: Annotated[typing.List[str], typer.Option("--page", "-p", help="add a page to be created")] = ["index"],
collection: Annotated[typing.List[str], typer.Option("--collection", "-c", help="add a collection to be created")]=["pages"],
add_blog: Annotated[bool, typer.Option("--blog")] = False

These are a list of items that can be used to create page and collection objects by cookiecutter templates and will be passed in with extra_context.

[kjaymiller]

cc @john0isaac