Make NPM packages publicly resolvable (#246)

This PR fixes the NPM URLs that were re-written to use an internal NPM
registry to be resolvable from public NPM registries instead.

It also makes a minor update to the `renovate.json` configuration file
by adding an `ignorePresets` entry to exclude the
`use-internal-registry` preset so the re-writing of URLs doesn't happen
again in the future.

Author: c-gerke

renovate.json

@@ -1,5 +1,8 @@
 {
   "extends": [
     "github>powerhome/renovate-config"
+  ],
+  "ignorePresets": [
+    "powerhome/renovate-config:use-internal-registry"
   ]
 }