[KYUUBI #1909] [DOCS] Remove unnecessary docs link in readme

<!--
Thanks for sending a pull request!

Here are some tips for you:
  1. If this is your first time, please read our contributor guidelines: https://kyuubi.readthedocs.io/en/latest/community/contributions.html
  2. If the PR is related to an issue in https://github.com/apache/incubator-kyuubi/issues, add '[KYUUBI #XXXX]' in your PR title, e.g., '[KYUUBI #XXXX] Your PR title ...'.
  3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][KYUUBI #XXXX] Your PR title ...'.
-->

### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
  1. If you add a feature, you can talk about the use case of it.
  2. If you fix a bug, you can clarify why it is a bug.
-->
fix the outdate link

### _How was this patch tested?_
![image](https://user-images.githubusercontent.com/12025282/154001369-9804aadf-0c91-41cd-a268-3180ef90029e.png)

Closes #1909 from ulysses-you/readme.

Closes #1909

50b0699 [ulysses-you] fix
f13e37f [ulysses-you] fix

Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>

README.md

@@ -93,13 +93,9 @@ The figure below shows our vision for the Kyuubi Ecosystem. Some of them have be
 
 ## Online Documentation
 
-Since Kyuubi 1.3.0-incubating, the Kyuubi online documentation is hosted by [https://kyuubi.apache.org/](https://kyuubi.apache.org/docs/latest/).
-You can find the specific version of Kyuubi documentation as listed below.
-
-- [1.3.0-incubating](https://kyuubi.apache.org/docs/r1.3.0-incubating/)
-- [stable](https://kyuubi.apache.org/docs/stable/)
-
-For 1.2 and earlier versions, please check the [Github Pages](https://kyuubi.readthedocs.io/en/v1.2.0/) directly.
+Since Kyuubi 1.3.0-incubating, the Kyuubi online documentation is hosted by [https://kyuubi.apache.org/](https://kyuubi.apache.org/).
+You can find the latest Kyuubi documentation on [this web page](https://kyuubi.apache.org/docs/latest/).
+For 1.2 and earlier versions, please check the [Readthedocs](https://kyuubi.readthedocs.io/en/v1.2.0/) directly.
 
 ## Quick Start