Update README.md (#4777)

README.md

@@ -14,7 +14,7 @@
 
 
 
-[<img src="docs/img/readme_banner.png" width="100%"/>](https://nni.readthedocs.io/)
+[<img src="docs/img/readme_banner.png" width="100%"/>](https://nni.readthedocs.io/en/stable)
 
 NNI automates feature engineering, neural architecture search, hyperparameter tuning, and model compression for deep learning. Find the latest features, API, examples and tutorials in our **[official documentation](https://nni.readthedocs.io/) ([简体中文版点这里](https://nni.readthedocs.io/zh/stable))**.
 
@@ -23,11 +23,8 @@ NNI automates feature engineering, neural architecture search, hyperparameter tu
 * **New release**: [v2.7 is available](https://github.com/microsoft/nni/releases/tag/v2.7) - _released on Apr-18-2022_
 * **New demo available**: [Youtube entry](https://www.youtube.com/channel/UCKcafm6861B2mnYhPbZHavw) | [Bilibili 入口](https://space.bilibili.com/1649051673) - _last updated on Apr-18-2022_
 * **New webinar**: [Introducing Retiarii: A deep learning exploratory-training framework on NNI](https://note.microsoft.com/MSR-Webinar-Retiarii-Registration-Live.html) - _scheduled on June-24-2021_
-* **New community channel**: [Discussions](https://github.com/microsoft/nni/discussions)
-* **New emoticons release**: [nnSpider](https://nni.readthedocs.io/en/latest/sharings/nn_spider.html)
-<div align="center">
-<a href="#nni-spider"><img width="100%" src="docs/source/sharings/images/nn_spider/home.svg" /></a>
-</div>
+* **Newly upgraded documentation**: [Doc upgraded](https://nni.readthedocs.io/en/stable)
+
 
 ## Installation
 
@@ -209,7 +206,7 @@ To update NNI to the latest version, add `--upgrade` flag to the above commands.
 
 ## Resources
 
-* [NNI Documentation Homepage](https://nni.readthedocs.io/)
+* [NNI Documentation Homepage](https://nni.readthedocs.io/en/stable)
 * [NNI Installation Guide](https://nni.readthedocs.io/en/stable/installation.html)
 * [NNI Examples](https://nni.readthedocs.io/en/latest/examples.html)
 * [Python API Reference](https://nni.readthedocs.io/en/latest/reference/python_api.html)