docs: update metadata on package.json

Now includes the LICENSE, and keywords.

Author: Tygo-van-den-Hurk

package.json

@@ -1,10 +1,12 @@
 {
     "name": "@tygo-van-den-hurk/slyde",
+    "license": "GPL-3.0-only",
     "description": "Make beautifully animated Slydes and presentations from XML with ease!",
     "homepage": "https://Tygo-van-den-Hurk.github.io/Slyde",
     "author": "Tygo van den Hurk",
     "version": "0.0.1",
     "private": false,
+    "keywords": ["cli", "xml", "typescript", "slyde", "easy", "presentation", "plugin-support"],
     "repository": {
         "type": "git",
         "url": "git://github.com/Tygo-van-den-Hurk/Slyde.git"
@@ -25,7 +27,6 @@
         "./dist"
     ],
     "publishConfig": {
-        "registry": "https://npm.pkg.github.com/",
         "access": "public"
     },
     "type": "module",