revert(package.json): simplify dev script back to next dev

Author: TylerAPfledderer

package.json

@@ -3,7 +3,7 @@
   "version": "8.0.0",
   "private": true,
   "scripts": {
-    "dev": "npx concurrently \"yarn next dev\" \"yarn theme:watch\"",
+    "dev": "next dev",
     "postinstall": "yarn theme",
     "build": "next build",
     "postbuild": "next-sitemap",
@@ -95,4 +95,4 @@
   "resolutions": {
     "jackspeak": "2.1.1"
   }
-}
+}