tweak collection-banner set up to make easier to switch styles

[evanwill]

current logic looks for {% if page.layout == "home-infographic" and site.data.theme.featured-image %} which is annoying if you create a custom home layout you have to manually edit this logic.
Might be easier if it was a page front matter option?
featured-image: true
or
banner-image: true
and maybe you could select a different featured image with the front matter option too.

Look at new About layout front matter, and harmonize options.

[evanwill]

this is completed!