Use prettier to also check CSS files and update lint-staged rules accordingly

.lintstagedrc.js

@@ -5,7 +5,7 @@ const relativeFilePaths = files => [...files.map(file => path.relative(cwd, file
 
 module.exports = {
   '{services,updater}/**/*.{js,jsx}': files => `eslint --fix ${files.join(' ')} --report-unused-disable-directives`,
-  '*.{js,json,md,yml,yaml,html}': files => `prettier --write ${files.join(' ')}`,
+  '*.{js,json,md,yml,yaml,html,css}': files => `prettier --write ${files.join(' ')}`,
   '*.css': files => `stylelint --fix ${files.join(' ')}`,
   Dockerfile: files =>
     `${dockerCmdBase} hadolint/hadolint:v2.12.0 hadolint --ignore DL3006 ${relativeFilePaths(files)}`,

.stylelintrc

@@ -1,22 +1,6 @@
 {
-  "extends": ["stylelint-config-standard", "stylelint-prettier/recommended"],
+  "extends": ["stylelint-config-standard"],
   "rules": {
-    "selector-type-no-unknown": [
-      true,
-      {
-        "ignoreTypes": ["/^--/", "--"]
-      }
-    ],
-    "selector-pseudo-class-no-unknown": [
-      true,
-      {
-        "ignorePseudoClasses": ["global"]
-      }
-    ],
-    "prettier/prettier": true,
-    "selector-class-pattern": null,
-    "custom-property-pattern": null,
-    "value-no-vendor-prefix": null,
-    "property-no-vendor-prefix": null
+    "selector-class-pattern": "^[a-z][a-zA-Z-]*$"
   }
 }