Removes files from package.json.

I just realized the `files` key was left over from my `0.0.*` setup and was only shipping files in the root directory of the built package, yet the entire implementation was actually under a `/src/...` directory, so only the `package.json` and `README.md` files were actually being published. 🤦

https://unpkg.com/browse/[email protected]/

package.json

@@ -38,11 +38,5 @@
     "http-server": "^14.1.1",
     "jasmine-core": "^4.5.0",
     "typescript": "^5.3.3"
-  },
-  "files": [
-    "/*.js",
-    "/*.d.ts",
-    "/*.js.map",
-    "/*.d.ts.map"
-  ]
+  }
 }