Clean up and tweak ESLint rules.

Also, refactor ESLint and stylelint config files; now everything will work from our root dir.

docs/4.0/examples/.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "env": {
+    "es6": false,
+    "jquery": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 5,
+    "sourceType": "script"
+  },
+  "extends": "../../../js/tests/unit/.eslintrc.json"
+}

docs/4.0/examples/.stylelintrc

@@ -1,5 +1,5 @@
 {
-  "extends": "../../../build/.stylelintrc",
+  "extends": "../../../.stylelintrc",
   "rules": {
     "at-rule-no-vendor-prefix": null,
     "comment-empty-line-before": null,