fix: generate correct registry URL (#413)

* Revert "Revert "fix(#300): correctly reference registry url from options" (#311)"

This reverts commit d955268c25.

* fix: generate full URL from path

tools/webpack.dev.config.babel.js

@@ -37,7 +37,7 @@ export default {
     }),
     new HTMLWebpackPlugin({
       __UI_OPTIONS: JSON.stringify({
-        base: '/',
+        base: new URL('/', 'https://localhost:4872'),
       }),
       title: 'Verdaccio Dev UI',
       scope: '',