Tailwind v3 -> v4 Upgrade (#2056)

Fixes #1998

Author: scottmakestech

package-lock.json

@@ -9,7 +9,7 @@
     "postcss": "^8.5.6",
     "postcss-cli": "^11.0.1",
     "postcss-import": "^16.1.1",
-    "tailwindcss": "^3.4.17"
+    "tailwindcss": "^4.1.15"
   },
   "scripts": {
     "test:htmllint": "htmlhint 'content/**/*.html'",