Script styleguide:build should not generate favicons in dist folder

[nicooprat]

Current behavior

npm run styleguide:build generates the styleguide folder, but also creates some files in the dist folder.

To reproduce

1. Create a new project with vue-cli: vue create styleguide-repro && cd styleguide-repro && vue add styleguidist
2. Generate the styleguide: npm run styleguide:build
3. See that dist/favicons/favicon.ico has been created

Expected behavior

Styleguidist shouldn't interfere with the dist folder which will be deployed on production.

Vue CLI version 3.3.0

From yarn.lock:

vue-cli-plugin-styleguidist@^3.26.0:
  version "3.26.0"
  resolved "https://registry.yarnpkg.com/vue-cli-plugin-styleguidist/-/vue-cli-plugin-styleguidist-3.26.0.tgz#afd0c0b6b7424e3b07c2ca964992342ce486cc4f"
  dependencies:
    null-loader "^0.1.1"
    vue-styleguidist "^3.26.0"
    webpack-merge "^4.2.1"

[elevatebart]

Thank you @nicooprat would you be interested in investigating what is going on ?