Don't do any merging of config values at all

Leave this up to the user; their config file is a JS file and we give
them access to the default config, so they can do as much merging of
defaults as they like.

src/util/mergeConfig.js

@@ -1,65 +0,0 @@
-import _ from 'lodash'
-
-const configTemplate = {
-  screens: null,
-  colors: null,
-  text: {
-    fonts: null,
-    sizes: null,
-    weights: null,
-    leading: null,
-    tracking: null,
-    colors: null,
-  },
-  backgrounds: {
-    colors: null,
-  },
-  borders: {
-    widths: null,
-    colors: null,
-  },
-  radiuses: null,
-  sizing: {
-    width: null,
-    height: null,
-    minHeight: null,
-    maxHeight: null,
-    minWidth: null,
-    maxWidth: null,
-  },
-  spacing: {
-    padding: null,
-    margin: null,
-    negativeMargin: null,
-  },
-  shadows: null,
-  zIndex: null,
-  opacity: null,
-}
-
-function replaceDefaults(template, defaults, replacements) {
-  return Object.keys(template).reduce((merged, key) => {
-    const value = template[key]
-
-    if (_.isPlainObject(value)) {
-      merged[key] = replaceDefaults(value, _.get(defaults, key), _.get(replacements, key))
-    } else {
-      merged[key] = _.get(replacements, key, _.get(defaults, key))
-    }
-
-    return merged
-  }, {})
-}
-
-function appendConfig(base, appends) {
-  return _.mergeWith({}, base, appends, (baseValue, appendsValue) => {
-    if (_.isArray(baseValue)) {
-      return baseValue.concat(appendsValue);
-    }
-  })
-}
-
-export default function mergeConfig(base, other) {
-  const replaced = replaceDefaults(configTemplate, base, other)
-  return appendConfig(replaced, _.get(other, 'extend', {}))
-}