Remove the types configuration from the package.json

The type files are at the same level of their source, this configuration
is not needed anymore and is breaking usage of the package with
skypack.dev.

Author: titouanmathis

package.json

@@ -25,7 +25,6 @@
   "publishConfig": {
     "access": "public"
   },
-  "types": "types/",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/studiometa/js-toolkit.git"