build: Use prettier for javascript

Stop ignoring .js and .json files in prettier and fix existing issues.

The `prettier-plugin-multiline-arrays` plugin is used to split arrays
with multiple elements into one line per element.

tailwind.config.js

@@ -2,8 +2,8 @@
 module.exports = {
   mode: process.env.TAILWIND_MODE ? 'jit' : '',
   content: [
-    "./src/app/**/*.{html,js}",
-    './index.html',
+    './src/app/**/*.{html,js}',
+    './index.html'
   ],
   theme: {
     extends: {
@@ -12,15 +12,14 @@ module.exports = {
         'fade-in-down': 'fade-in-down 0.3s ease-out',
         'fade-out-down': 'fade-out-down 0.3s ease-out',
         'fade-in-up': 'fade-in-up 0.3s ease-out',
-        'fade-out-up': 'fade-out-up 0.3s ease-out',
+        'fade-out-up': 'fade-out-up 0.3s ease-out'
       },
       boxShadow: {
-        custom: '0px 0px 50px 0px rgb(82 63 105 / 15%)',
-      },
-    },
+        custom: '0px 0px 50px 0px rgb(82 63 105 / 15%)'
+      }
+    }
   },
   plugins: [
-    require("@tailwindcss/forms")
-  ],
-}
-
+    require('@tailwindcss/forms')
+  ]
+};