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)
This should be reworded to say that the settings are already configured for SMC, but that they can be changed if desired. This repo is not one that other people will fork for their own purposes. It's the SMC-specific version, so really the only people who will be installing it locally would be developers like us who are maintaining it. So, the documentation should be geared towards future developers who might be maintaing it after us.