docs: update readme before archiving the repo

Author: IgorMinar

README.md

@@ -1,29 +1,13 @@
-# This angular.io documentation repository is closed
-
-**Please do not add issues or pull requests to this repo.** 
-We are no longer making changes to documentation in this repository.
-We will no longer process new issues or PRs and we will close them automatically.
+# This angular.io documentation repository is closed and preserved just for archival purposes
 
 **Please post new [issues](https://github.com/angular/angular/issues) and [pull requests](https://github.com/angular/angular/pulls) to the content folder in [https://github.com/angular/angular/tree/master/aio/content](https://github.com/angular/angular/tree/master/aio/content)**.
 
-Be sure to prefix your issue/PR title with "**docs(aio):**"
-
 <hr>
 
 # Angular.io
-[![Build Status][travis-badge]][travis-badge-url]
-
-# This angular.io documentation repository is closed
-
-**Please do not add issues or pull requests to this repo.** 
-We are no longer making changes to documentation in this repository.
-We will no longer process new issues or PRs and we will close them automatically.
+----------
 
-**Please post new [issues](https://github.com/angular/angular/issues) and [pull requests](https://github.com/angular/angular/pulls) to the content folder in [https://github.com/angular/angular/tree/master/aio/content](https://github.com/angular/angular/tree/master/aio/content)**.
-
-Be sure to prefix your issue/PR title with "**docs(aio):**"
-
----
+[![Build Status][travis-badge]][travis-badge-url]
 
 Angular.io is site for Angular **documentation** .