Slightly tweak storybook asset paths

And fix eslint errors.

.gitlab/ci/frontend.gitlab-ci.yml

@@ -360,4 +360,4 @@ compile-storybook:
     expire_in: 31d
     when: always
     paths:
-      - public
+      - storybook/public

.gitlab/ci/pages.gitlab-ci.yml

@@ -14,9 +14,9 @@ pages:
     - mv coverage/ public/coverage-ruby/ || true
     - mv coverage-frontend/ public/coverage-frontend/ || true
     - mv coverage-javascript/ public/coverage-javascript/ || true
+    - mv storybook/public public/storybook || true
     - cp .public/assets/application-*.css public/application.css || true
     - cp .public/assets/application-*.css.gz public/application.css.gz || true
-    - cp .public/storybook public/storybook || true
   artifacts:
     paths:
       - public

storybook/config/preview.js

-/* eslint-disable import/no-unresolved, import/no-commonjs */
 const stylesheetsRequireCtx = require.context(
   '../../app/assets/stylesheets',
   true,

storybook/config/webpack.config.js

 /* eslint-disable no-param-reassign */
 
 const { statSync } = require('fs');
+const path = require('path');
 const sass = require('node-sass');
 const { buildIncludePaths, resolveGlobUrl } = require('node-sass-magic-importer/dist/toolbox');
-const path = require('path');
 const webpack = require('webpack');
 const gitlabWebpackConfig = require('../../config/webpack.config.js');