Replace broken-link-checker with linkinator. (#28291)

Much lighter, more modern and cleaner codebase.

.travis.yml

@@ -13,7 +13,7 @@ before_script:
   - google-chrome-stable --product-version
 script:
   - npm test || travis_terminate 1
-  - if [[ "$TRAVIS_NODE_VERSION" = "8" ]]; then npm run check-broken-links; fi
+  - if [[ "$TRAVIS_NODE_VERSION" = "8" ]]; then npm run linkinator; fi
   - if [[ "$TRAVIS_NODE_VERSION" = "8" && "$TRAVIS_EVENT_TYPE" = "push" && ! `git log --format=%B --no-merges -n 1 | grep '\[skip browser\]'` ]]; then npm run js-test-cloud; fi
 after_success:
   - if [[ "$TRAVIS_NODE_VERSION" = "8" ]]; then npm run coveralls; fi

package.json

@@ -19,10 +19,8 @@
   ],
   "scripts": {
     "start": "npm-run-all --parallel watch docs-serve",
-    "blc": "blc --exclude-external --filter-level 3 --follow --get --ordered --recursive --host-requests 4 --input http://localhost:3000/",
-    "http-server": "http-server --silent -p 3000",
+    "linkinator": "linkinator _gh_pages --recurse --skip \"^(?!http://localhost)\"",
     "bundlesize": "bundlesize",
-    "check-broken-links": "npm-run-all --parallel --race \"http-server -- _gh_pages/\" blc",
     "css": "npm-run-all css-compile css-prefix css-minify css-copy",
     "css-copy": "cross-env-shell shx mkdir -p site/docs/$npm_package_version_short/dist/ && cross-env-shell shx cp -r dist/css/ site/docs/$npm_package_version_short/dist/",
     "css-main": "npm-run-all css-lint css-compile-main css-prefix-main css-minify-main css-copy",
@@ -109,7 +107,6 @@
     "autoprefixer": "^9.4.7",
     "babel-eslint": "^10.0.1",
     "babel-plugin-istanbul": "^5.1.1",
-    "broken-link-checker": "^0.7.8",
     "bundlesize": "0.15.3",
     "clean-css-cli": "^4.2.1",
     "coveralls": "^3.0.2",
@@ -118,7 +115,6 @@
     "find-unused-sass-variables": "^0.3.2",
     "glob": "^7.1.3",
     "hammer-simulator": "0.0.1",
-    "http-server": "^0.11.1",
     "ip": "^1.1.5",
     "jquery": "^3.3.1",
     "karma": "^3.1.4",
@@ -129,6 +125,7 @@
     "karma-firefox-launcher": "^1.1.0",
     "karma-qunit": "^2.1.0",
     "karma-sinon": "^1.0.5",
+    "linkinator": "^1.1.6",
     "node-sass": "^4.11.0",
     "nodemon": "^1.18.10",
     "npm-run-all": "^4.1.5",