docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

aio/content/tutorial/toh-pt1.md

@@ -2,7 +2,7 @@
 The Hero Editor
 
 @intro
-We build a simple hero editor
+We build a simple hero editor.
 
 @description
 ## Setup to develop locally

aio/content/tutorial/toh-pt2.md

@@ -2,7 +2,7 @@
 Master/Detail
 
 @intro
-We build a master/detail page with a list of heroes
+We build a master/detail page with a list of heroes.
 
 @description
 Our story needs more heroes.

aio/content/tutorial/toh-pt3.md

@@ -2,7 +2,7 @@
 Multiple Components
 
 @intro
-We refactor the master/detail view into separate components
+We refactor the master/detail view into separate components.
 
 @description
 Our app is growing.

aio/content/tutorial/toh-pt4.md

@@ -2,7 +2,7 @@
 Services
 
 @intro
-We create a reusable service to manage our hero data calls
+We create a reusable service to manage our hero data calls.
 
 @description
 The Tour of Heroes is evolving and we anticipate adding more components in the near future.

aio/content/tutorial/toh-pt5.md

@@ -2,7 +2,7 @@
 Routing
 
 @intro
-We add the Angular Router and learn to navigate among the views
+We add the Angular Router and learn to navigate among the views.
 
 @description
 We received new requirements for our Tour of Heroes application:

aio/content/tutorial/toh-pt6.md

@@ -2,7 +2,7 @@
 HTTP
 
 @intro
-We convert our service and components to use Angular's HTTP service
+We convert our service and components to use Angular's HTTP service.
 
 @description
 Our stakeholders appreciate our progress.