feat: theme as plugin

[juanpicado]

Type: feature

Request:

We want to allow custom themes imported via dependencies, this might be the beginning of the theme as a plugin.

Solution:

This PR moves the UI to a separated (https://github.com/verdaccio/ui) repository under the name of @verdaccio/ui-theme as default dependency. To override the custom theme you need to add the following to the configuration file.

theme:
  dark:
    option1: 1
    option2: 2

The plugin must follow the format according to the previous example verdaccio-theme-{dark}.

⚠️ The prefix is strict and the plugin only will be resolved whether the name starts with verdaccio-theme-.

If is need it, the properties will be passed as options as any other plugin, this might help to create more dynamic themes.

fix #357

follow up of #1215

[verdacciobot]

👍

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