The Growth team created a configuration page to allow community to configure the features, see https://www.mediawiki.org/wiki/Growth/Community_configuration.
In addition to the features already covered by the Growth team features, there is also homepage banner, which can be configured via https://ar.wikipedia.org/wiki/%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Growth-homepage-banner. However, this is not mentioned or controled by the config form. Maybe we should mention it in the form?
I'm not sure editing the banner directly from the form is a good idea (as it would likely require a lot of previews to make sure it's rightly formated), but mentioning it with an info message sounds good enough to me.