Feature/emulsify linting setup

.eslintignore

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+node_modules/
+dist/
+*.min.js
+*.bundle.js

.eslintrc.json

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+{
+  "extends": [
+    "airbnb",
+    "prettier",
+    "plugin:prettier/recommended"
+  ],
+  "plugins": ["prettier"],
+  "root": true,
+  "env": {
+    "es6": true,
+    "browser": true,
+    "jest": true
+  },
+  "globals": {
+    "Drupal": true
+  },
+  "rules": {
+    "strict": 0,
+    "prettier/prettier": "error"
+  }
+}

.prettierrc.json

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+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

.stylelintrc.json

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+{
+  "extends": [
+    "stylelint-config-standard",
+    "stylelint-config-prettier"
+  ],
+  "plugins": ["stylelint-prettier"],
+  "rules": {
+    "at-rule-no-unknown": [ true, {
+      "ignoreAtRules": [
+        "include",
+        "mixin",
+        "extend",
+        "if",
+        "else",
+        "each",
+        "content",
+        "import",
+        "function",
+        "return"
+      ]
+    }],
+    "no-descending-specificity": null,
+    "function-calc-no-invalid": null,
+    "prettier/prettier": true
+  }
+}