Get rid of `nuzzle.edn`, pass config map to API functions directly

[stelcodes]

Having a config file makes it impossible to functionally generate pages. This means that it's really hard to use a headless CMS to get data from. I absolutely want to support using sanity.io, directus, wordpress, etc. I wanted to have a flat config file to keep things simple but really the users need more power of their config value in order for Nuzzle to be truly useful.