build(aio): move doc-gen stuff from angular.io (#14097)

tools/docs/links-package/services/deprecatedDocsLinkDisambiguator.js

@@ -0,0 +1,12 @@
+var _ = require('lodash');
+
+module.exports = function deprecatedDocsLinkDisambiguator() {
+  return function(url, title, currentDoc, docs) {
+    if (docs.length != 2) return docs;
+
+    var filteredDocs = _.filter(
+        docs, function(doc) { return !doc.fileInfo.relativePath.match(/\/(\w+)-deprecated\//); });
+
+    return filteredDocs.length > 0 ? filteredDocs : docs;
+  };
+};