package.json: Add description field

APPARENTLY NPM ADDS A npm_package_description WHICH IS THE description
FIELD IN package.json WHICH HOWEVER IF NOT SET BECOMES THE SECOND LINE
OF THE README LIKE WHAT THE FUCKKKKKKKKKKKKK

package.json

 {
   "name": "mastodon",
+  "description": "mastodon",
   "license": "AGPL-3.0-or-later",
   "engines": {
     "node": ">=8 <11"