Tweak stylelint config (#38228)

* rename to .stylelintrc.json
* add reportInvalidScopeDisables to config
* move reportNeedlessDisables to config
* merge the two configs
* remove unneeded disabled rules from the examples config

.stylelintrc.json

@@ -0,0 +1,60 @@
+{
+  "extends": [
+    "stylelint-config-twbs-bootstrap"
+  ],
+  "reportInvalidScopeDisables": true,
+  "reportNeedlessDisables": true,
+  "overrides": [
+    {
+      "files": "**/*.scss",
+      "rules": {
+        "declaration-property-value-disallowed-list": {
+          "border": "none",
+          "outline": "none"
+        },
+        "function-disallowed-list": [
+          "calc",
+          "lighten",
+          "darken"
+        ],
+        "property-disallowed-list": [
+          "border-radius",
+          "border-top-left-radius",
+          "border-top-right-radius",
+          "border-bottom-right-radius",
+          "border-bottom-left-radius",
+          "transition"
+        ],
+        "scss/dollar-variable-default": [
+          true,
+          {
+            "ignore": "local"
+          }
+        ],
+        "scss/selector-no-union-class-name": true
+      }
+    },
+    {
+      "files": "scss/**/*.{test,spec}.scss",
+      "rules": {
+        "scss/dollar-variable-default": null,
+        "declaration-no-important": null
+      }
+    },
+    {
+      "files": "site/**/*.scss",
+      "rules": {
+        "scss/dollar-variable-default": null
+      }
+    },
+    {
+      "files": "site/**/examples/**/*.css",
+      "rules": {
+        "comment-empty-line-before": null,
+        "property-no-vendor-prefix": null,
+        "selector-no-qualifying-type": null,
+        "value-no-vendor-prefix": null
+      }
+    }
+  ]
+}