DEV: Update linting setup (#31392)

stylelint.config.mjs

@@ -1,42 +1,3 @@
 export default {
-  extends: ["stylelint-config-standard-scss"],
-  rules: {
-    "color-no-invalid-hex": true,
-    "unit-no-unknown": true,
-    "at-rule-empty-line-before": null,
-    "rule-empty-line-before": [
-      "always",
-      { except: ["after-single-line-comment", "first-nested"] },
-    ],
-    "selector-class-pattern": null,
-    "custom-property-pattern": null,
-    "declaration-empty-line-before": "never",
-    "alpha-value-notation": null,
-    "color-function-notation": null,
-    "shorthand-property-no-redundant-values": null,
-    "declaration-block-no-redundant-longhand-properties": null,
-    "no-descending-specificity": null,
-    "keyframes-name-pattern": null,
-    "scss/dollar-variable-pattern": null,
-    "number-max-precision": null,
-    "scss/at-extend-no-missing-placeholder": null,
-    "scss/load-no-partial-leading-underscore": null,
-    "scss/operator-no-newline-after": null,
-    "selector-id-pattern": null,
-    "no-invalid-position-at-import-rule": null,
-    "scss/at-function-pattern": null,
-    "scss/comment-no-empty": null,
-    "scss/at-mixin-pattern": null,
-    "media-feature-range-notation": "prefix",
-    "property-no-vendor-prefix": [
-      true,
-      {
-        ignoreProperties: [
-          "backdrop-filter",
-          "text-size-adjust",
-          "user-select",
-        ],
-      },
-    ],
-  },
+  extends: ["@discourse/lint-configs/stylelint"],
 };