Fixes #31 - Add settings config from upstream

Incorporates custom settings config from upstream (the architecture, but not the content from https://github.com/codeforamerica/ohana-web-search/pull/444)
Why is the naming of file important here? app_logo is still descriptive for this image in SMC-Connect. I wouldn't think forks of ohana-web-search would have to replace app_logo.png with their own image _and also_ change the filename (they can if they want, but I'm missing why it's necessary).