[KYUUBI #4034] [K8S][HELM] Move helm chart to dedicated directory

### _Why are the changes needed?_
The changes are needed to be compliant with Helm recommendations:
1. https://helm.sh/docs/topics/charts/#the-chart-file-structure
```
The directory name is the name of the chart (without versioning information).
Thus, a chart describing WordPress would be stored in a wordpress/ directory.
```
2. https://helm.sh/docs/howto/chart_releaser_action/#repository-changes
```
The charts should be placed under /charts directory at the top-level of the directory tree.
```

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #4034 from dnskr/move_helm_chart_to_dedicated_directory.

Closes #4034

b6f4b661 [dnskr] [K8S][HELM] Move helm chart to dedicated directory

Authored-by: dnskr <dnskrv88@gmail.com>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>

docs/quick_start/quick_start_with_helm.md

@@ -35,7 +35,7 @@ create ns kyuubi
 
 #### Get kyuubi started
 ```bash
-helm install kyuubi-helm ${KYUUBI_HOME}/docker/helm -n ${namespace_name}
+helm install kyuubi-helm ${KYUUBI_HOME}/charts/kyuubi -n ${namespace_name}
 ```
 It will print variables and the way to get kyuubi expose ip and port.
 ```bash