chore: remove keywords

As per manifest version 3 it's "Unrecognized manifest key 'keywords'."

Author: akhileshthite

public/manifest.json

@@ -5,7 +5,6 @@
   "version": "3.3",
   "author": "P2P Labs",
   "homepage_url": "https://p2plabs.xyz/",
-  "keywords": ["dscan", "ipfs", "web3.storage", "qr code", "decentralization"],
   "permissions": ["storage"],
   "background": {
     "service_worker": "background.js"