Add sources for the UI project

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.eslintrc

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+{
+  "extends": "standard",
+  "rules": {
+    "arrow-parens": ["error", "always"],
+    "comma-dangle": ["error", "always-multiline"],
+    "max-len": [1, 120, 2],
+    "spaced-comment": "off"
+  }
+}

.gitignore

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+/build/
+/node_modules/
+/public/

.gitlab-ci.yml

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+image: node:8.11.1-alpine
+stages: [setup, verify, deploy]
+yarn:
+  stage: setup
+  cache:
+    paths:
+    - .yarn-cache/
+  script:
+  - &run_yarn
+    yarn --cache-folder=.yarn-cache --pure-lockfile > /dev/null
+lint:
+  stage: verify
+  cache: &pull_cache
+    policy: pull
+    paths:
+    - .yarn-cache/
+  script:
+  - *run_yarn
+  - node_modules/.bin/gulp lint
+bundle-stable:
+  stage: deploy
+  only:
+  - master@antora/antora-ui-default
+  cache: *pull_cache
+  script:
+  - *run_yarn
+  - node_modules/.bin/gulp pack
+  artifacts:
+    paths:
+    - build/ui-bundle.zip
+bundle-dev:
+  stage: deploy
+  except:
+  - master
+  cache: *pull_cache
+  script:
+  - *run_yarn
+  - node_modules/.bin/gulp pack
+  artifacts:
+    expire_in: 1 day # unless marked as keep from job page
+    paths:
+    - build/ui-bundle.zip
+pages:
+  stage: deploy
+  only:
+  - master@antora/antora-ui-default
+  cache: *pull_cache
+  script:
+  - *run_yarn
+  - node_modules/.bin/gulp build:preview
+  # FIXME figure out a way to avoid copying these files to preview site
+  - rm -rf public/_/{helpers,layouts,partials}
+  artifacts:
+    paths:
+    - public

.nvmrc

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+8

.stylelintrc

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+{
+  "extends": "stylelint-config-standard",
+  "rules": {
+    "comment-empty-line-before": null
+  }
+}