chore: add scaffold for antora-based catalog

.gitignore

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+node_modules
+/docs/build

docs/antora-playbook.yml

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+site:
+  title: Kamelet Catalog
+  url: https://camel.apache.org/
+  start_page: camel-kamelets::index.adoc
+content:
+  sources:
+  - url: ../
+    branches: HEAD
+    start_path: docs
+asciidoc:
+  extensions:
+    - "@djencks/asciidoctor-antora-indexer"
+ui:
+  bundle:
+    url: ./kamelet-catalog-ui/build/ui-bundle.zip
+

docs/antora.yml

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+name: camel-kamelets
+title: Kamelet Catalog
+version: latest
+nav:
+- modules/ROOT/nav.adoc

docs/kamelet-catalog-ui/.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

docs/kamelet-catalog-ui/.eslintrc

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

docs/kamelet-catalog-ui/.gitignore

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

docs/kamelet-catalog-ui/.gitlab-ci.yml

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+image: node:10.14.2-stretch
+stages: [setup, verify, deploy]
+install:
+  stage: setup
+  cache:
+    paths:
+    - .cache/npm
+  script:
+  - &npm_install
+    npm install --quiet --no-progress --cache=.cache/npm
+lint:
+  stage: verify
+  cache: &pull_cache
+    policy: pull
+    paths:
+    - .cache/npm
+  script:
+  - *npm_install
+  - node_modules/.bin/gulp lint
+bundle-stable:
+  stage: deploy
+  only:
+  - master@antora/antora-ui-default
+  cache: *pull_cache
+  script:
+  - *npm_install
+  - node_modules/.bin/gulp bundle
+  artifacts:
+    paths:
+    - build/ui-bundle.zip
+bundle-dev:
+  stage: deploy
+  except:
+  - master
+  cache: *pull_cache
+  script:
+  - *npm_install
+  - node_modules/.bin/gulp bundle
+  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:
+  - *npm_install
+  - node_modules/.bin/gulp preview:build
+  # FIXME figure out a way to avoid copying these files to preview site
+  - rm -rf public/_/{helpers,layouts,partials}
+  artifacts:
+    paths:
+    - public

docs/kamelet-catalog-ui/.gulp.json

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+{
+  "description": "Build tasks for the Antora default UI project",
+  "flags.tasksDepth": 1
+}

docs/kamelet-catalog-ui/.nvmrc

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+10

docs/kamelet-catalog-ui/.stylelintrc

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+{
+  "extends": "stylelint-config-standard",
+  "rules": {
+    "comment-empty-line-before": null,
+    "no-descending-specificity": null,
+  }
+}