docs: remove public/docs/dart (#2956)

* tutorial when back ported

* api when backported

* guide when backported

* quickstart, cheatsheet and glossary when backported

* remove Jekyll front matter from each back ported file

* backport Dart _util-fns.jade

* remove docs/dart

* gitignore docs/dart

* only include Dart in language menu if it exists

* README: remove mention of Dart

Author: chalin

.gitignore

@@ -32,4 +32,5 @@ public/docs/*/latest/guide/cheatsheet.json
 protractor-results.txt
 link-checker-results.txt
 *a2docs.css
-/dist
+/dist
+/public/docs/dart

README.md

@@ -35,19 +35,13 @@ if not install [nvm](https://github.com/creationix/nvm) to get node going on you
 
   - this repo
   - [angular/angular source code repo](https://github.com/angular/angular)
-  - (OPTIONAL) [dart-lang/angular2 source code repo](https://github.com/dart-lang/angular2); 
-    cloning the Angular Dart repo is only necessary if you plan on doing full site builds
 
-  to the same parent directory. The **cloned repo directories must be siblings**, with the latter two repo directories named **angular** and **angular-dart**, respectively.
+  to the same parent directory. The **cloned repo directories must be siblings**, with the latter named **angular**.
 
 1. cd into root directory `angular.io/`
 
 1. Install local npm packages by running `./scripts/install.sh`
 
-1. (OPTIONAL) If you intend on doing **full site builds** then you must have the
-   Angular Dart repo (see the Clone step above), _and_ Dart tooling available.
-   Both can be installed by running `./scripts/deploy-install.sh`
-
 1. See [below](#code-sample-development) for code sample development preparation.
 
 ## Content Development
@@ -116,8 +110,7 @@ You must check that your example is free of lint errors.
 
 All samples should be covered to some degree by end-to-end tests:
 - `gulp run-e2e-tests` to run all TypeScript and JavaScript tests
-- `gulp run-e2e-tests --lang=dart` to run all Dart tests
-- `gulp run-e2e-tests --lang=all` to run TypeScript, JavaScript, and Dart tests
+- `gulp run-e2e-tests --lang=all` to run TypeScript and JavaScript tests
 - `gulp run-e2e-tests --filter=quickstart` to filter the examples to run, by name
 - `gulp run-e2e-tests --fast` to ignore npm install, webdriver update and boilerplate copy
 

public/_includes/_version-dropdown.jade

@@ -72,5 +72,6 @@ if current.path[4] !== 'change-log'
       mixin tree(public.docs.ts, "/docs/ts", "Angular for TypeScript")
       mixin tree(public.docs.js, "/docs/js", "Angular for JavaScript")
       //- Disable cross-language link for API entry pages (but keep for top API search page):
-      if ! (current.path[3] === 'api' && public.docs[current.path[1]][current.path[2]][current.path[3]][current.path[4]])
+      - var isApiEntryPage = current.path[3] === 'api' && public.docs[current.path[1]][current.path[2]][current.path[3]][current.path[4]]
+      if public.docs.dart && !isApiEntryPage
         mixin tree(public.docs.dart, "/docs/dart", "Angular for Dart")