clean up styles & extend old browser support via autoprefixer/eslint 🧓🏻

and stop encoding emojis like a caveman

.stylelintrc

@@ -3,12 +3,20 @@
     "stylelint-config-sass-guidelines",
     "stylelint-prettier/recommended"
   ],
-  "plugins": ["stylelint-prettier"],
+  "plugins": [
+    "stylelint-no-unsupported-browser-features",
+    "stylelint-prettier"
+  ],
   "rules": {
     "color-hex-length": "long",
-    "function-url-quotes": null,
     "max-nesting-depth": 6,
     "order/properties-alphabetical-order": null,
+    "plugin/no-unsupported-browser-features": [true, {
+      "severity": "warning",
+      "ignore": [
+        "flexbox"
+      ]
+    }],
     "selector-max-compound-selectors": null,
     "selector-max-id": null,
     "selector-no-qualifying-type": null,