Maintenance: Updated the npm dependencies for stylelint.

.gitignore

@@ -43,7 +43,6 @@
 
 # NPM / Yarn
 /node_modules
-/yarn.lock
 
 # logfiles and tempfiles
 /log

package.json

@@ -4,13 +4,13 @@
     "lint:css:fix": "stylelint \"**/*.{css,scss}\" --fix"
   },
   "devDependencies": {
-    "postcss": "^8.3.9",
-    "postcss-html": "^1.0.1",
-    "prettier": "2.4.1",
-    "stylelint": "^14.0.0",
+    "postcss": "^8.4.4",
+    "postcss-html": "^1.3.0",
+    "prettier": "2.5.0",
+    "stylelint": "^14.1.0",
     "stylelint-config-prettier": "^9.0.3",
-    "stylelint-config-standard": "^23.0.0",
-    "stylelint-config-standard-scss": "^2.0.0",
-    "stylelint-prettier": "^1.2.0"
+    "stylelint-config-standard": "^24.0.0",
+    "stylelint-config-standard-scss": "^3.0.0",
+    "stylelint-prettier": "^2.0.0"
   }
 }