chore: remove npmignore in favor of files array

Author: kanadgupta

.npmignore

@@ -4,6 +4,9 @@
   "description": "Jest/Vitest matcher for asserting valid HAR definitions",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
+  "files": [
+    "dist/"
+  ],
   "scripts": {
     "build": "tsc",
     "lint": "eslint . --ext .js,.ts && npm run prettier && tsc",