packaging: Use an include list in package.json

Rather than playing whack a mole with an exclude list, let's use
an include list instead.

.npmignore

@@ -1,25 +0,0 @@
-# This file must not contain generated assets listed in .gitignore.
-# npm-debug.log and node_modules/ are ignored by default.
-# See https://docs.npmjs.com/misc/developers#keeping-files-out-of-your-package
-
-# Ignore all dot files except for .thelounge_home
-.*
-!.thelounge_home
-
-# Ignore client folder as it's being built into public/ folder
-# except for the specified files which are used by the server
-client/**
-!client/js/constants.ts
-!client/js/helpers/ircmessageparser/findLinks.ts
-!client/js/helpers/ircmessageparser/cleanIrcMessage.ts
-!client/index.html.tpl
-
-public/js/bundle.vendor.js.map
-coverage/
-scripts/
-test/
-appveyor.yml
-webpack.config*.js
-postcss.config.js
-renovate.json
-

package.json

@@ -42,6 +42,15 @@
   "engines": {
     "node": ">=14.0.0"
   },
+  "files": [
+    "./.thelounge_home",
+    "./index.js",
+    "./yarn.lock",
+    "./client/index.html.tpl",
+    "./dist/package.json",
+    "./dist/**/*.js",
+    "./public/**"
+  ],
   "dependencies": {
     "@fastify/busboy": "1.0.0",
     "bcryptjs": "2.4.3",