Refactor file names and remove unused code

Author: typicode

src/Observer.ts

@@ -10,7 +10,7 @@ import { DataFile, JSONFile } from 'lowdb/node'
 import { PackageJson } from 'type-fest'
 
 import { createApp } from './app.js'
-import { Observer } from './Observer.js'
+import { Observer } from './observer.js'
 import { Data } from './service.js'
 
 // Parse args

src/bin.ts

@@ -4,7 +4,5 @@ module.exports = {
   theme: {
     extend: {},
   },
-  plugins: [
-    require('@tailwindcss/typography'),
-  ],
+  plugins: [require('@tailwindcss/typography')],
 }