refactor: improve bundle size

Signed-off-by: Manuel Ruck <[email protected]>

package.json

@@ -1,13 +1,16 @@
 {
   "name": "@democracy-deutschland/bt-dip-sdk",
-  "version": "1.3.0",
+  "version": "1.3.0-alpha.0",
   "description": "Bundestag DIP - TypeScript SDK",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
   "author": "Manuel Ruck <[email protected]>",
   "license": "Apache-2.0",
   "homepage": "https://www.democracy-deutschland.de",
   "repository": "https://github.com/demokratie-live/bt-dip-sdk",
+  "files": [
+    "lib"
+  ],
   "scripts": {
     "build": "pnpm gen && tsc && node esbuild.js",
     "gen": "pnpm gen-sdk && pnpm gen-docs",