Add configurable text/banners and dynamic templates

[wisygig]

@hndrewaall said:

I want to have configurable text/banners, at least sufficient to tell people roughly what's happening
so that'll likely involve adding some settings to a config page
and editing templates to load content dynamically

[wisygig]

@hndrewaall Do you have a wireframe for what you want? I'll add the backend support for now (extra admin config page + update admin utils to load site settings)

[hndrewaall]

I do not. Do what makes sense to you and I'm sure it'll be a good start.