repair doc tools and polish the docs code (#5038)

* set private access modifier

* repair doc build tools

* fix lit issues

* re-generate version index

tools/doc/tools/linkFixer.js

@@ -1,4 +1,5 @@
 "use strict";
+// tslint:disable: no-console
 Object.defineProperty(exports, "__esModule", { value: true });
 var path = require("path");
 var fs = require("fs");